A263915 Number of (not necessarily connected) simple bridged graphs with n nodes.

0, 1, 2, 6, 18, 79, 462, 4344, 69130, 1994511, 106159534, 10456891547, 1904341902688, 641869332391172, 401549418479234409, 467956969039256753054, 1019786043659665470506946, 4171198012616858743636651785, 32134630668466555232483869886654

Offset

1,3

Links

Andrew Howroyd, Table of n, a(n) for n = 1..30

Eric Weisstein's World of Mathematics, Bridged Graph

Eric Weisstein's World of Mathematics, Simple Graph

Formula

a(n) = A000088(n) - A263914(n).

Crossrefs

Cf. A000088 (number of simple graphs).

Cf. A007146 (number of simple connected bridgeless graphs).

Cf. A052446 (number of simple connected bridged graphs).

Cf. A263914 (number of simple bridgeless graph).

Sequence in context: A266858 A141580 A007869 * A360516 A144557 A327729

Adjacent sequences: A263912 A263913 A263914 * A263916 A263917 A263918

Keyword

nonn

Author

Eric W. Weisstein, Oct 29 2015

Extensions

More terms using formula by Falk Hüffner, Jan 18 2016

Status

approved