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A139680 Number of n X n symmetric binary matrices with no row sum greater than 4. 0
1, 2, 8, 64, 1024, 28217, 1146419, 62951431, 4451407563, 392447922178, 42102440864054, 5391561047209898, 811314950514676762 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

CROSSREFS

Sequence in context: A191572 A191573 A136283 * A153544 A153572 A191574

Adjacent sequences:  A139677 A139678 A139679 * A139681 A139682 A139683

KEYWORD

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net), Jun 13 2008

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Last modified February 17 03:20 EST 2012. Contains 205978 sequences.