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A102388
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Number of ways of placing n nonattacking Queens of the Night on an n X n board.
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10
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1, 0, 0, 0, 0, 0, 0, 0, 0, 4, 44, 6, 78, 8, 16, 18, 234, 124, 468, 516, 882, 2092, 7068, 22794, 85456, 275732, 974048, 3698242, 14120996, 59531852, 252272512, 1163430462
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,10
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COMMENTS
| A Queen of the Night can move like a Queen or a Nightrider, which is a rider along straight lines of Knight moves.
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LINKS
| Noam D. Elkies, Chess Pages and Links.
P. Syski, S. J. Wernli, Queen of the Night on an n X n board.
V. Kotesovec, Non-attacking chess pieces.
W. Schubert, N-Queens page.
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PROG
| See C++ code on website.
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CROSSREFS
| Cf. A051223, A051224, A000170.
Sequence in context: A153255 A015084 A176827 * A071125 A193448 A200456
Adjacent sequences: A102385 A102386 A102387 * A102389 A102390 A102391
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KEYWORD
| hard,more,nonn
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AUTHOR
| Stefan Wernli, Peter Syski (swernli(AT)fas.harvard.edu), Jan 07 2005
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EXTENSIONS
| Terms a(20)-a(28) from Vaclav Kotesovec (kotesovec(AT)chello.cz), Jun 18 2010 and Feb 02 2011
Terms a(29)-a(32) from Wolfram Schubert, Jul 24 2011
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