A130613 Number of ways of placing non-attacking knights on an n X n chessboard symmetric about main diagonal.

1, 2, 8, 26, 125, 1089, 11632, 180936, 3829276, 122898169, 5157005541, 328952820944, 27732644636492, 3546034350173724, 597955340246293229, 153413017541604438052, 51883480594556703445379

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