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A139671 Number of n X n symmetric binary matrices with all row sums 5. 1
1, 76, 6912, 848932, 133948836, 26615510712, 6549149852112, 1966499966796816 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

Table of n, a(n) for n=5..12.

CROSSREFS

Sequence in context: A049669 A198476 A234778 * A098606 A093276 A184290

Adjacent sequences:  A139668 A139669 A139670 * A139672 A139673 A139674

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 12 2008

STATUS

approved

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Last modified October 21 01:14 EDT 2019. Contains 328291 sequences. (Running on oeis4.)