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A143886 Number of ways of placing kings with no more than 4 mutual attacks on an n X n chessboard. 4
1, 2, 15, 267, 9450, 577785, 58537749, 9751519234, 2673230750387, 1220300742842014 (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, A143881.

Cf. A143887, A143888, A143889, A143890, A143891, A143892, A143893.

Sequence in context: A264907 A195737 A192567 * A174482 A076111 A087526

Adjacent sequences:  A143883 A143884 A143885 * A143887 A143888 A143889

KEYWORD

nonn,more,hard

AUTHOR

R. H. Hardin, Sep 04 2008

STATUS

approved

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Last modified June 1 18:43 EDT 2020. Contains 334762 sequences. (Running on oeis4.)