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A139671 Number of n X n symmetric binary matrices with all row sums 5. 3
1, 76, 6912, 848932, 133948836, 26615510712, 6549149852112, 1966499966796816, 711040444591249476, 305907023641901084832, 154921887640109512226304, 91469751377953081098144816, 62419855497729620428436222688, 48849705066296300911892229634944 (list; graph; refs; listen; history; text; internal format)
OFFSET
5,2
LINKS
CROSSREFS
Column k=5 of A333157 and row 5 of A188448.
Sequence in context: A049669 A198476 A234778 * A098606 A093276 A184290
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 February 21 12:33 EST 2024. Contains 370235 sequences. (Running on oeis4.)