A129432 Number of isomorphism classes of connected 6-regular multigraphs of order n, loops allowed.

1, 3, 9, 47, 291, 2789, 35646, 622457, 14019433, 395208047, 13561118011, 555498075986, 26751985389463, 1496090275853092, 96154662330195078, 7038800665162854369, 582281978355495520076, 54057819690711609171892, 5597375885970846586170796, 642829784413912305507730345

Offset: 1

Author

Brendan McKay, Apr 15 2007

Keywords

• nonn

Comments

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

Crossrefs

Column k=6 of A333397.

Cf. A129433, A129421, A005967, A085549, A129430, A129434, A129436.

Formula

Inverse Euler transform of A129433. - Andrew Howroyd, Mar 19 2020

Extensions

a(13)-a(20) added by Andrew Howroyd, Mar 19 2020