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A143871 Number of ways of placing kings with no more than 1 mutual attack on an n X n chessboard symmetric under horizontal reflection. 1
1, 2, 3, 13, 18, 425, 371, 27872, 25147, 8144945, 4679546, 6097351181, 3118820527, 16876586891126, 6022295415137 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..14.

CROSSREFS

Sequence in context: A118134 A215386 A338216 * A225517 A254462 A275030

Adjacent sequences:  A143868 A143869 A143870 * A143872 A143873 A143874

KEYWORD

nonn,more,hard

AUTHOR

R. H. Hardin, Sep 04 2008

STATUS

approved

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Last modified June 22 21:29 EDT 2021. Contains 345393 sequences. (Running on oeis4.)