A129422 Number of isomorphism classes of 6-regular loopless multigraphs of order n.

0, 1, 1, 7, 16, 128, 955, 13467, 253373, 6466074, 205749149, 7943313377, 363853255012, 19485170158346, 1205488841884007, 85308028236495340, 6846462326434510551, 618498122199399056707, 62478078728492272712838, 7015617595855429187696753

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 A333330.

Cf. A129421, A129433, A129416, A129418, A129420, A129424, A129426.

Formula

Euler transform of A129421. - Andrew Howroyd, Mar 14 2020

Extensions

a(1)=0 prepended and a(14)-a(20) from Andrew Howroyd, Mar 17 2020