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Number of isomorphism classes of connected 6-regular multigraphs of order n, loops allowed.
8

%I #8 Mar 21 2020 20:11:20

%S 1,3,9,47,291,2789,35646,622457,14019433,395208047,13561118011,

%T 555498075986,26751985389463,1496090275853092,96154662330195078,

%U 7038800665162854369,582281978355495520076,54057819690711609171892,5597375885970846586170796,642829784413912305507730345

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

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

%F Inverse Euler transform of A129433. - _Andrew Howroyd_, Mar 19 2020

%Y Column k=6 of A333397.

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

%K nonn

%O 1,2

%A _Brendan McKay_, Apr 15 2007

%E a(13)-a(20) added by _Andrew Howroyd_, Mar 19 2020