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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
OFFSET
0,2
CROSSREFS
Sequence in context: A150707 A150708 A150709 * A143338 A027267 A060414
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 25 2008
STATUS
approved