A139682 Number of n X n symmetric binary matrices with no row sum greater than 6.

1, 2, 8, 64, 1024, 32768, 2097152, 254409765, 52635426489, 16734894319214, 7584366191600668, 4658699927786935270, 3743721825782942609558, 3832881704712490758507152, 4895883231714885655148797216, 7669344273849107780888127116263, 14522102432152504473007144076157867

Offset

0,2

Links

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

Crossrefs

Column k=6 of A334548.

Sequence in context: A153576 A139681 A084282 * A139683 A139684 A139685

Adjacent sequences: A139679 A139680 A139681 * A139683 A139684 A139685

Keyword

nonn

Author

R. H. Hardin, Jun 13 2008

Status

approved