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A143883 Number of ways of placing kings with no more than 3 mutual attacks on an n X n chessboard symmetric about main diagonal. 1
1, 2, 7, 29, 160, 1135, 10529, 125770, 1963039, 39868375, 1061669314, 37110747097, 1708827058427 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..12.

CROSSREFS

Sequence in context: A030956 A329259 A185310 * A346427 A003437 A192410

Adjacent sequences:  A143880 A143881 A143882 * A143884 A143885 A143886

KEYWORD

nonn,more,hard

AUTHOR

R. H. Hardin, Sep 04 2008

STATUS

approved

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Last modified May 27 02:41 EDT 2022. Contains 354093 sequences. (Running on oeis4.)