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A139681
Number of n X n symmetric binary matrices with no row sum greater than 5.
2
1, 2, 8, 64, 1024, 32768, 1914733, 178499118, 23973965155, 4356864886906, 1028823851939030, 306635655405986312, 112789704243814005142, 50281311185009713150048, 26760450115727957945767409, 16787646103442094018698106106, 12278130772483524854754380090307
OFFSET
0,2
LINKS
CROSSREFS
Column k=5 of A334548.
Sequence in context: A084281 A153548 A153576 * A084282 A139682 A139683
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 13 2008
EXTENSIONS
Terms a(13) and beyond from Andrew Howroyd, May 08 2020
STATUS
approved