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Search: id:A130728
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A130728 Number of ways of placing non-attacking knights on an n X n chessboard symmetric under 90 degree rotation. +0
1
1, 2, 2, 6, 3, 27, 28, 324, 338, 5991, 6875, 228512, 322056, 17782554, 30487207, 2704389848, 5451449965, 819155081866, 1981437279113, 497332226754331, 1457925225531230, 603767469974886673, 2133983730438871395 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Sequence in context: A081745 A129889 A130712 this_sequence A092384 A061915 A138565

Adjacent sequences: A130725 A130726 A130727 this_sequence A130729 A130730 A130731

KEYWORD

nonn

AUTHOR

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

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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