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A143876 Number of ways of placing kings with no more than 2 mutual attacks on an n X n chessboard symmetric under horizontal reflection. 1
1, 2, 3, 27, 26, 1119, 921, 122658, 74887, 43743593, 18775998, 43803694319, 14699916393, 143879089856822, 34113001129873 (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: A258766 A056722 A181225 * A184506 A126203 A126655

Adjacent sequences:  A143873 A143874 A143875 * A143877 A143878 A143879

KEYWORD

nonn,more,hard

AUTHOR

R. H. Hardin, Sep 04 2008

STATUS

approved

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Last modified May 27 05:14 EDT 2020. Contains 334649 sequences. (Running on oeis4.)