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Number of ways of placing non-attacking knights on an n X n chessboard symmetric under horizontal reflection.
0

%I #4 Mar 31 2012 12:35:06

%S 1,2,4,26,35,821,1462,148176,221880,96574099,126381799,196582061878,

%T 269726664738,1805524692669120,2273457768078921,66873306557904082902,

%U 76981272132177635155,9380430300181898788236006

%N Number of ways of placing non-attacking knights on an n X n chessboard symmetric under horizontal reflection.

%K nonn

%O 0,2

%A _R. H. Hardin_, Aug 25 2008