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Search: id:A143874
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A143874 Number of ways of placing kings with no more than 1 mutual attack on an n X n chessboard symmetric under 180 degree rotation. +0
1
1, 2, 3, 7, 18, 111, 497, 4630, 38327, 702227, 10398834 (list; graph; listen)
OFFSET

0,2

CROSSREFS

Sequence in context: A032102 A100388 A160181 this_sequence A073641 A117763 A165571

Adjacent sequences: A143871 A143872 A143873 this_sequence A143875 A143876 A143877

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net), Sep 04 2008

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Last modified November 25 08:46 EST 2009. Contains 167481 sequences.


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