N= 4(rot4) 1 solutions 2 positions in 4 cases 6 N= 6(rot4) 3 solutions 6 positions in 13 cases 10 N= 8(rot4) 4 solutions 31 positions in 52 cases 12 N=10(rot4) 7 solutions 50 positions in 109 cases 14 N=12(rot4) 4 solutions 134 positions in 267 cases 15 N=14(rot4) 13 solutions 427 positions in 834 cases 17 N=16(rot4) 13 solutions 1216 positions in 2369 cases 19 N=18(rot4) 7 solutions 3678 positions in 7239 cases 21 N=20(rot4) 16 solutions 12762 positions in 25359 cases 24 N=22(rot4) 8 solutions 43775 positions in 87725 cases 26 N=24(rot4) 23 solutions 172384 positions in 348525 cases 28 N=26(rot4) 36 solutions 635972 positions in 1312727 cases 30 N=28(rot4) 58 solutions 2426606 positions in 5064378 cases 32 N=30(rot4) 92 solutions 10055597 positions in 21260698 cases 35 N=32(rot4) 101 solutions 41022297 positions in 87400498 cases 37 N=34(rot4) 172 solutions 168383018 positions in 363622438 cases 39 N=36(rot4) 281 solutions 716940864 positions in 1560703284 cases N=38(rot4) 337 solutions 2919705760 positions in 6421336586 cases N=40(rot4) 541 solutions 13588395302 positions in 30096669418 cases N=42(rot4) 746 solutions 60613686833 positions in 135387069687 cases