A129430 Number of isomorphism classes of connected 5-regular multigraphs of order 2n, loops allowed.

3, 26, 639, 40264, 5846105, 1620621150, 752480161278, 538934691750368, 562620407713724992, 820458681175954269942, 1616087981640640784235446, 4183688192689449962777539596, 13914233045360143936837907106395, 58319096569220501055727735345999221

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..14.

Formula

Inverse Euler transform of A129431. - Andrew Howroyd, Mar 19 2020

Crossrefs

Column k=5 of A333397.

Cf. A129431, A129419, A005967, A085549, A129432, A129434, A129436.

Sequence in context: A103112 A064941 A112612 * A005156 A355120 A101613

Adjacent sequences: A129427 A129428 A129429 * A129431 A129432 A129433

Keyword

nonn

Author

Brendan McKay, Apr 15 2007

Extensions

a(8)-a(14) added by Andrew Howroyd, Mar 21 2020

Status

approved