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Search: id:A051223
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| A051223 |
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Number of ways of placing n nonattacking superqueens on an n X n board. |
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+0
4
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| 1, 0, 0, 0, 0, 0, 0, 0, 0, 4, 44, 156, 1876, 5180, 32516, 202900, 1330622, 8924976, 64492432, 495864256, 3977841852, 34092182276, 306819842212, 2883202816808, 28144109776812
(list; graph; listen)
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OFFSET
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1,10
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COMMENT
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A superqueen moves like a queen and a knight.
A linear time algorithm giving an explicit solution for any n >= 10 for the n-super-queens-problem can be found at the link. Included is an online solver, implemented in Javascript. - Frank Schwellinger (nummer_eins(AT)web.de), Mar 19 2004
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LINKS
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Anonymous, N x N SuperQueens Solutions Table
D. Bill, Durango Bill's The N-Queens Problem
F. Schwellinger, Explicit Solution To the N-Super-Queens Problem.
W. Schubert, N-Queens page [From W. Schubert (wschubnq(AT)gmx.de), Jul 31 2009]
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CROSSREFS
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Cf. A051224, A000170.
Sequence in context: A102388 A071125 A053314 this_sequence A077435 A074751 A129551
Adjacent sequences: A051220 A051221 A051222 this_sequence A051224 A051225 A051226
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KEYWORD
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nonn,more,new
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AUTHOR
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Ulrich Schimke (ulrschimke(AT)aol.com)
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EXTENSIONS
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a(20) from Bill link added Jul 25 2006
Three further terms supplied by Max Alekseyev from the "Anonymous" link.
Added a(24). - W. Schubert (wschubnq(AT)gmx.de), Jul 31 2009
Added a(25). W. Schubert (wschubnq(AT)gmx.de), Nov 29 2009
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