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A139014 Number of n X n symmetric binary matrices containing no more than four 1s in any 3 X 3 sub-block. 0
1, 2, 8, 32, 314, 5328, 141832, 6811777, 564010260, 79061881217, 19181583464422, 8010187646338006, 5733911909201520816, 7059956003044566892312 (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: A262480 A062797 A134751 * A063505 A085466 A084039

Adjacent sequences:  A139011 A139012 A139013 * A139015 A139016 A139017

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 31 2008

STATUS

approved

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Last modified March 30 19:49 EDT 2020. Contains 333127 sequences. (Running on oeis4.)