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A139675 Number of n X n symmetric binary matrices with all row sums 8. 3
1, 2620, 8372754, 30649435140, 133475706272700, 711040444591249476, 4686484162304929219950, 38295413179145036856212700, 386860001875783390762182911250, 4805622573099374975572752075805000, 72929153106385401417284439399165879652 (list; graph; refs; listen; history; text; internal format)
OFFSET

8,2

LINKS

Andrew Howroyd, Table of n, a(n) for n = 8..20

CROSSREFS

Column k=8 of A333157 and row 8 of A188448.

Sequence in context: A180330 A238921 A156398 * A292175 A295482 A236621

Adjacent sequences:  A139672 A139673 A139674 * A139676 A139677 A139678

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 12 2008

EXTENSIONS

Terms a(13) and beyond from Andrew Howroyd, Mar 09 2020

STATUS

approved

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Last modified November 28 21:30 EST 2021. Contains 349415 sequences. (Running on oeis4.)