A129423 - OEIS

%I #12 Mar 21 2020 13:20:51

%S 1,7,263,90614,165041329,861723619902,10351918806321621,

%T 253216618556625008961,11542463442106815907796586,

%U 915449471830886733265105097578

%N Number of isomorphism classes of connected 7-regular loopless multigraphs of order 2n.

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

%H Brendan McKay and Adolfo Piperno, <a href="http://pallini.di.uniroma1.it">Nauty and Traces</a>

%F Inverse Euler transform of A129424. - _Andrew Howroyd_, Mar 21 2020

%o (nauty/bash) geng -c -d1 $[2*$n] -q | multig -r7 -u # _Natan Arie Consigli_, Dec 20 2019

%Y Column k=7 of A328682.

%Y Cf. A129424, A129434, A000421, A129417, A129419, A129421, A129425, A328682.

%K nonn

%O 1,2

%A _Brendan McKay_, Apr 15 2007

%E a(7)-a(10) from _Andrew Howroyd_, Mar 21 2020