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

1,2

Comments

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

Links

Table of n, a(n) for n=1..20.

Formula

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

Crossrefs

Column k=6 of A333397.

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

Sequence in context: A190627 A221986 A018445 * A111551 A258481 A102929

Adjacent sequences: A129429 A129430 A129431 * A129433 A129434 A129435

Keyword

nonn

Author

Brendan McKay, Apr 15 2007

Extensions

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

Status

approved