A139685 Number of n X n symmetric binary matrices with no row sum greater than 9.

1, 2, 8, 64, 1024, 32768, 2097152, 268435456, 68719476736, 35184372088832, 35680013894626133, 69256173251646457490, 241954801784975938299853, 1412334943658808490059334190, 12845700351286288760264255058879, 171982565320546482600201655399505478

Offset

0,2

Links

Andrew Howroyd, Table of n, a(n) for n = 0..20

H. D. Nguyen, D. Taggart, Mining the OEIS: Ten Experimental Conjectures, 2013. (mentions this sequence)

Crossrefs

Column k=9 of A334548.

Sequence in context: A139682 A139683 A139684 * A006125 A193753 A006119

Adjacent sequences: A139682 A139683 A139684 * A139686 A139687 A139688

Keyword

nonn

Author

R. H. Hardin, Jun 13 2008

Extensions

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

Status

approved