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A139676 Number of n X n symmetric binary matrices with all row sums 9. 0
1, 9496, 108306280, 1322299270600 (list; graph; refs; listen; history; text; internal format)
OFFSET

9,2

LINKS

Table of n, a(n) for n=9..12.

CROSSREFS

Sequence in context: A204961 A237104 A156402 * A291209 A235424 A235420

Adjacent sequences:  A139673 A139674 A139675 * A139677 A139678 A139679

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 12 2008

STATUS

approved

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Last modified September 27 04:03 EDT 2022. Contains 357052 sequences. (Running on oeis4.)