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A130712 Number of ways of placing non-attacking knights on an n X n chessboard symmetric about the diagonal and under 90 degree rotation. +0
1
1, 2, 2, 6, 3, 21, 12, 118, 56, 959, 333, 9892, 3038, 154506, 38869, 3291314, 689349, 103050492, 17202265, 4328976863, 615532072, 271539093065, 30694296121, 22908330863086, 2181826599454, 2875160955130336, 217661432837240 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Adjacent sequences: A130709 A130710 A130711 this_sequence A130713 A130714 A130715

Sequence in context: A028421 A081745 A129889 this_sequence A130728 A092384 A061915

KEYWORD

nonn

AUTHOR

Ron Hardin (rhh(AT)cadence.com), Aug 25 2008

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.

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