A129434 Number of isomorphism classes of connected 7-regular multigraphs of order 2n, loops allowed.

4, 91, 12398, 8530044, 20068725095, 122563246940846, 1657847267734501346, 44557979504639651662163, 2193071655191529316254072193, 185380797361862371952777763438426

Offset

1,1

Comments

Initial terms computed using software at http://users.cecs.anu.edu.au/~bdm/nauty/

Links

Table of n, a(n) for n=1..10.

Formula

Inverse Euler transform of A129435. - Andrew Howroyd, Mar 19 2020

Crossrefs

Column k=7 of A333397.

Cf. A129435, A129423, A005967, A085549, A129430, A129432, A129436.

Sequence in context: A195551 A024261 A337827 * A248041 A209984 A113252

Adjacent sequences: A129431 A129432 A129433 * A129435 A129436 A129437

Keyword

nonn

Author

Brendan McKay, Apr 15 2007

Extensions

a(6)-a(10) added by Andrew Howroyd, Mar 21 2020

Status

approved