A139683 Number of n X n symmetric binary matrices with no row sum greater than 7.

1, 2, 8, 64, 1024, 32768, 2097152, 268435456, 66628946641, 29707592691510, 21634670753754060, 23709506474859569328, 36821021837919664452090, 77635187673471762914463552, 215313862348697780762374273824, 766493362781127793638943080523776

Offset

0,2

Links

Andrew Howroyd, Table of n, a(n) for n = 0..25

Crossrefs

Column k=7 of A334548.

Sequence in context: A139681 A084282 A139682 * A139684 A139685 A006125

Adjacent sequences: A139680 A139681 A139682 * A139684 A139685 A139686

Keyword

nonn

Author

R. H. Hardin, Jun 13 2008

Extensions

Terms a(13) and beyond from Andrew Howroyd, May 08 2020

Status

approved