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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, 2, 8, 54, 750, 20314, 1052864, 105578342, 20460453442, 7658537650814, 5538947499948096, 7739159053160945260, 20889681750864696919512, 108933637117589912345519132 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..13.

CROSSREFS

Sequence in context: A133316 A005440 A183282 * A134954 A087422 A081667

Adjacent sequences:  A139013 A139014 A139015 * A139017 A139018 A139019

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 31 2008

STATUS

approved

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Last modified May 25 00:21 EDT 2013. Contains 225631 sequences.