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A130666 Number of ways of placing non-attacking knights on an n X n chessboard symmetric about both diagonal and antidiagonal. +0
1
1, 2, 4, 10, 21, 89, 248, 1652, 5760, 59789, 268529, 4367552, 24922412, 641484896, 4607113999, 188770443286, 1702258930069, 111575238563044, 1256539208451845, 132483845142611245, 1854392449274745630, 316017552098202250347 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Sequence in context: A065023 A123445 A104431 this_sequence A036954 A109679 A023036

Adjacent sequences: A130663 A130664 A130665 this_sequence A130667 A130668 A130669

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net), Aug 25 2008

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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