A143879 - OEIS

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A143879

Number of ways of placing kings with no more than 2 mutual attacks on an n X n chessboard symmetric about both diagonal and antidiagonal.

1

1, 2, 3, 7, 12, 41, 85, 434, 1009, 7325, 21498, 219307, 803859, 11370922

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

OFFSET

0,2

LINKS

Table of n, a(n) for n=0..13.

CROSSREFS

Sequence in context: A056356 A084708 A035003 * A056293 A275311 A056294

Adjacent sequences: A143876 A143877 A143878 * A143880 A143881 A143882

KEYWORD

nonn,more,hard

AUTHOR

R. H. Hardin, Sep 04 2008

STATUS

approved