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A143881 Number of ways of placing kings with no more than 3 mutual attacks on an n X n chessboard. 4
1, 2, 15, 207, 6084, 292607, 23511001, 3132847224, 693856861039, 259806377729539 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..9.

CROSSREFS

Cf. A143870, A143875, A143886.

Cf. A143882, A143883, A143884, A143885.

Sequence in context: A020565 A282521 A099718 * A298692 A132493 A135860

Adjacent sequences:  A143878 A143879 A143880 * A143882 A143883 A143884

KEYWORD

nonn,more,hard

AUTHOR

R. H. Hardin, Sep 04 2008

STATUS

approved

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Last modified May 31 09:30 EDT 2020. Contains 334748 sequences. (Running on oeis4.)