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 A269133 Number of ways to place m nonattacking queens on an m X n board, 1 <= m <= n (triangular array). 1
 1, 2, 0, 3, 2, 0, 4, 6, 4, 2, 5, 12, 14, 12, 10, 6, 20, 36, 46, 40, 4, 7, 30, 76, 140, 164, 94, 40, 8, 42, 140, 344, 568, 550, 312, 92, 9, 56, 234, 732, 1614, 2292, 2038, 1066, 352, 10, 72, 364, 1400, 3916, 7552, 9632, 7828, 4040, 724, 11, 90, 536, 2468, 8492, 21362, 37248, 44148, 34774, 15116, 2680, 12, 110, 756, 4080, 16852, 52856, 120104, 195270, 222720, 160964, 68264, 14200 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Math StackExchange, State space for eight queen problem EXAMPLE The triangular array begins: n\m 1  2   3   4    5     6     7      8      9      10     11    12 1   1 2   2  0 3   3  2   0 4   4  6   4   2 5   5  12  14  12   10 6   6  20  36  46   40    4 7   7  30  76  140  164   94    40 8   8  42  140 344  568   550   312    92 9   9  56  234 732  1614  2292  2038   1066   352 10  10 72  364 1400 3916  7552  9632   7828   4040   724 11  11 90  536 2468 8492  21362 37248  44148  34774  15116  2680 12  12 110 756 4080 16852 52856 120104 195270 222720 160964 68264 14200 ... CROSSREFS Cf. A000170 (m=n). Cf. A000027 (m=1), A002378 (m=2), A061989 (m=3), A061990 (m=4), A061991 (m=5), A061992 (m=6), A061993 (m=7), A172449 (m=8). Sequence in context: A342238 A154559 A342239 * A143324 A287416 A097418 Adjacent sequences:  A269130 A269131 A269132 * A269134 A269135 A269136 KEYWORD nonn,tabl AUTHOR Marko Riedel, Feb 19 2016 STATUS approved

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Last modified December 3 17:23 EST 2021. Contains 349467 sequences. (Running on oeis4.)