A194497 Number of ways to arrange 7 nonattacking queens on the lower triangle of an n X n board.
0, 0, 0, 0, 0, 0, 0, 0, 0, 10, 1210, 27198, 322782, 2564988, 15372702, 74615814, 306900410, 1105651074, 3569169990, 10512880400, 28628691842, 72880455042, 174895586328, 398556484840, 867314768878, 1811576604968, 3646385889888
Offset: 1
Keywords
Examples
Some solutions for 10 X 10: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 1 0 0 0 0 0 1 0 0 0 1 0 0 0 0 1 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 1 0 0 1 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0
Links
- R. H. Hardin, Table of n, a(n) for n = 1..28
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