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A130613 Number of ways of placing non-attacking knights on an n X n chessboard symmetric about main diagonal. 0
1, 2, 8, 26, 125, 1089, 11632, 180936, 3829276, 122898169, 5157005541, 328952820944, 27732644636492, 3546034350173724, 597955340246293229, 153413017541604438052, 51883480594556703445379 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..16.

CROSSREFS

Sequence in context: A150707 A150708 A150709 * A143338 A027267 A060414

Adjacent sequences:  A130610 A130611 A130612 * A130614 A130615 A130616

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 25 2008

STATUS

approved

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Last modified August 5 00:15 EDT 2021. Contains 346456 sequences. (Running on oeis4.)