N  solutions    positions         cases     stones   factor     time
-------------------------------------------------------------------------
   1       0             1               1         0      1.000
   2       1             1               3         4      3.000
   3       0             1               1         0      0.333
   4       2             4              10         7     10.000
   5       0             4               8         7      0.800
   6       2             7              19         9      2.375
   7       0             8              15         9      0.789
   8       0            20              38         9      2.533
   9       0            22              40        10      1.053
  10       2            47             100        11      2.500
  11       0            60             121        12      1.210
  12       2           139             278        13      2.298
  13       1           178             347        14      1.248
  14       3           385             757        15      2.182
  15       1           470             935        16      1.235
  16       1          1071            2007        17      2.147
  17       0          1305            2527        18      1.259
  18       2          3056            5796        19      2.294
  19       0          4004            7800        20      1.346
  20       2          9598           18267        21      2.342
  21       0         11954           23259        22      1.273
  22       1         27939           54284        22      2.334      0m2.20s
  23       1         37506           73383        24      1.352      0m3.26s
  24       2         90429          175537        25      2.392      0m7.30s
  25       2        120467          236085        26      1.345     0m10.91s
  26       0        290848          571438        27      2.420     0m26.38s
  27       0        390197          773101        28      1.353     0m37.31s
  28       0        975605         1918760        29      2.482     1m32.25s
  29       1       1334072         2635775        30      1.374     2m13.38s
  30       1       3323959         6581432        30      2.497     5m35.13s
  31       2       4465497         8907433        32      1.353     8m02.80s
  32       1      11380926        22570226        32      2.534
  33       0      15052908        30126674        34      1.335
  34       0      38248922        76747736        34      2.548
  35       1      55537473       111841854        36      1.457
  36       1     141030750       283427623        36      2.534
  37       0     192725235       388969252        38      1.372
  38       1     503609589      1016465815        38      2.613
  39       0     725258994      1474538598                1.451
  40       0    1831979677      3727350688                2.527      ( 160 h)
  41       0    2662388096      5427622263                1.456      ( 248 h)
  42       1
  43       0    9884593534     20291816356
  44       1   26316861808     53956529641                2.659      (2872 h)
  45       0   38724165710     79706767721                1.477      (4184 h)