Solutions of the No_Three_in_Line problem on small boards n all . / - : x o + * sum ----------------------------------------------------------------------------- 1 0 0 0 0 0 0 2 1 0 0 0 0 0 0 0 1 1 3 2 0 0 0 1 1 4 11 0 0 1 1 1 0 0 1 4 5 32 3 2 0 0 5 6 50 4 0 0 2 2 3 0 0 11 7 132 11 1 10 0 22 8 380 40 5 1 7 0 4 0 0 57 9 368 41 3 7 0 51 10 1135 132 3 0 13 1 6 0 1 156 11 1120 122 6 30 0 158 12 4348 524 3 0 33 2 4 0 0 566 13 3622 407 9 82 1 499 14 10568 1284 5 0 61 3 13 0 0 1366 15 .. 13 283 1 .. 16 .. 14 0 189 1 13 0 0 .. 17 .. 12 282 0 .. 18 .. 14 0 328 2 7 0 0 .. 19 .. 16 594 0 .. 20 .. 17 0 693 2 16 0 0 .. 21 .. 13 2413 0 .. 22 .. 18 0 1 8 0 0 .. 23 .. 34 1 .. 24 .. 2 23 0 0 .. 25 . 2 . 26 .. 0 36 0 0 .. 27 . . 0 . 28 .. 0 58 0 0 .. 29 . 1 . 30 .. 1 62 0 0 .. 31 . 2 . 32 .. 1 99 0 0 .. 33 0 34 .. 0 172 0 0 .. 35 . 1 . 36 .. 1 281 0 0 .. 37 0 38 . 1 . 0 0 . 39 0 40 . 0 . 0 0 . 41 0 42 . . 0 . 43 44 . . 0 . 45 46 . . 0 . Canadian Mathematical Bulletin V.11/1968 p. 527-531 Scientific American V236 March 1977 Martin Gardner p. 139 - 140 (13-16) Journal of Combinatorial Theory Series A V.18/1975 p. 336 - 341 (<=10) Journal of Combinatorial Theory Series A V.20/1976 p. 363 - 364 (11,12) Journal of Combinatorial Theory Series A V.24/1978 p. 126 - 127 (14,16) Journal of Combinatorial Theory Series A V.26/1979 p. 82 - 83 (18,20) Journal of Combinatorial Theory Series A V.27/1979 p. 365 - 366 (22,24,26) Combinatorial Mathematics: Proceedings of the Second Australian Conference Vol. 403 of Lecture Notes in Mathematics Michael Adena / Derek Holton Discrete Mathematic V73/1988 p.89-90 (17,19) Journal of Combinatorial Theory Series A V.60/1992 p. 305 - 311 (...,46) [update: 28.6.92]