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Search: id:A139016
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A139016 Number of n X n symmetric binary matrices containing no more than six 1s in any 3 X 3 sub-block. +0
1
1, 2, 8, 54, 750, 20314, 1052864, 105578342, 20460453442, 7658537650814, 5538947499948096, 7739159053160945260, 20889681750864696919512, 108933637117589912345519132 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Sequence in context: A073564 A005155 A005440 this_sequence A134954 A087422 A081667

Adjacent sequences: A139013 A139014 A139015 this_sequence A139017 A139018 A139019

KEYWORD

nonn

AUTHOR

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

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Last modified December 4 23:11 EST 2009. Contains 170347 sequences.

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