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A129898
Number of ways of placing non-attacking knights on an n X n chessboard symmetric under horizontal and vertical reflection.
0
1, 2, 2, 10, 7, 63, 38, 1252, 456, 42951, 11051, 2411116, 461788, 300699154, 38535499, 76231743090, 6586274655, 36545866507976, 2160036716063, 34857588279065543, 1397443585027894, 67527452467684091249
OFFSET
0,2
CROSSREFS
Sequence in context: A094359 A293060 A293061 * A135996 A141610 A019241
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 25 2008
STATUS
approved