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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
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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:
A195737
A192567
A354980
*
A174482
A076111
A371673
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 August 21 14:08 EDT 2024. Contains 375353 sequences. (Running on oeis4.)