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A225740
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Number of arrangements of n nonattacking Queens on an n X n board, with no Queens on both main diagonals.
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2
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0, 0, 0, 2, 0, 4, 0, 12, 8, 12, 64, 760, 2080, 11524, 77672, 454376, 2972720, 19274208, 160500016, 1150812148, 9797154696, 79646705916, 771589104392
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OFFSET
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1,4
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LINKS
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Vaclav Kotesovec, example, board 8x8, no queens on line a1-h8 and no queens on line a8-h1
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EXAMPLE
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Solutions for n=9 filtered from the Coserea link in A000170:
3 5 8 2 9 7 1 4 6
3 6 9 2 8 1 4 7 5
4 6 9 3 1 8 2 5 7
5 3 6 9 2 8 1 4 7
5 7 4 1 8 2 9 6 3
6 4 1 7 9 2 8 5 3
7 4 1 8 2 9 6 3 5
7 5 2 8 1 3 9 6 4
(End)
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CROSSREFS
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KEYWORD
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nonn,more,hard
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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