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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, 2, 2, 6, 3, 27, 28, 324, 338, 5991, 6875, 228512, 322056, 17782554, 30487207, 2704389848, 5451449965, 819155081866, 1981437279113, 497332226754331, 1457925225531230, 603767469974886673, 2133983730438871395 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..22.

CROSSREFS

Sequence in context: A130712 A276075 A321908 * A276085 A324122 A324349

Adjacent sequences:  A130725 A130726 A130727 * A130729 A130730 A130731

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 25 2008

STATUS

approved

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Last modified April 19 03:04 EDT 2019. Contains 322237 sequences. (Running on oeis4.)