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Search: id:A080337
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| 1, 3, 12, 59, 339, 2210, 16033, 127643, 1103372, 10269643, 102225363, 1082190554, 12126858113, 143268057587, 1778283994284, 23120054355195, 314017850216371, 4444972514600178, 65435496909148513, 999907522895563403
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OFFSET
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1,2
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COMMENT
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Number of symmetric positions of non-attacking rooks on upper-diagonal part of 2n X 2n chessboard.
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LINKS
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Joerg Arndt, Fxtbook
J. Quaintance, Letter representations of rectangular m x n x p proper arrays
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FORMULA
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Binomial transform of A002872 (sorting numbers).
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MATHEMATICA
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Table[Sum[ Binomial[n, k] A002872[[k + 1]], {k, 0, n}], {n, 0, 24}]
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CROSSREFS
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Cf. A002872, A080107.
Sequence in context: A058861 A105668 A064856 this_sequence A101054 A122752 A020102
Adjacent sequences: A080334 A080335 A080336 this_sequence A080338 A080339 A080340
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KEYWORD
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nonn
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AUTHOR
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Wouter Meeussen (wouter.meeussen(AT)pandora.be), Mar 18 2003
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EXTENSIONS
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Comment corrected by Wouter Meeussen (wouter.meeussen(AT)pandora.be), Aug 14 2009
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