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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..21.

CROSSREFS

Sequence in context: A094359 A293060 A293061 * A135996 A141610 A019241

Adjacent sequences:  A129895 A129896 A129897 * A129899 A129900 A129901

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 25 2008

STATUS

approved

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Last modified June 25 14:43 EDT 2019. Contains 324352 sequences. (Running on oeis4.)