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A130666 Number of ways of placing non-attacking knights on an n X n chessboard symmetric about both diagonal and antidiagonal. 0
1, 2, 4, 10, 21, 89, 248, 1652, 5760, 59789, 268529, 4367552, 24922412, 641484896, 4607113999, 188770443286, 1702258930069, 111575238563044, 1256539208451845, 132483845142611245, 1854392449274745630, 316017552098202250347 (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: A301700 A123445 A104431 * A179116 A358357 A036954

Adjacent sequences: A130663 A130664 A130665 * A130667 A130668 A130669

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 25 2008

STATUS

approved

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Last modified December 1 23:44 EST 2022. Contains 358485 sequences. (Running on oeis4.)