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URL: https://oeis.org/A143871

⇱ A143871 - OEIS

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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
OFFSET
0,2
CROSSREFS
Sequence in context: A215386 A352539 A338216 * A225517 A389000 A254462
KEYWORD
nonn,more,hard
AUTHOR
R. H. Hardin, Sep 04 2008
STATUS
approved