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A139012 Number of n X n symmetric binary matrices containing no more than three 1s in any 3 X 3 sub-block. +0
2
1, 2, 7, 20, 146, 1660, 24266, 619885, 24951532, 1491389352, 141842503743, 21156539568960, 4861988525864115, 1744688422871068399, 977626718408600885914, 851525107752786868842753 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Sequence in context: A095268 A118397 A009697 this_sequence A132605 A088157 A079034

Adjacent sequences: A139009 A139010 A139011 this_sequence A139013 A139014 A139015

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net), May 31 2008

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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