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A139679
Number of n X n symmetric binary matrices with no row sum greater than 3.
2
1, 2, 8, 64, 809, 13846, 301262, 8035168, 255780779, 9519891214, 407613033836, 19816627136912, 1082142442901863, 65776576008442274, 4416031241930248774, 325289604104049686096, 26137255635911145802777, 2279186202842678350137218, 214713550195887533572753024
OFFSET
0,2
LINKS
CROSSREFS
Column k=3 of A334548.
Sequence in context: A224801 A191571 A347012 * A005640 A153540 A153568
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 13 2008
EXTENSIONS
Terms a(13) and beyond from Andrew Howroyd, May 08 2020
STATUS
approved