A361454 - OEIS

%I #5 Mar 21 2023 23:08:47

%S 1,4,17,78,360,1835,10168,62271,419701,3107800,25108419,219982357,

%T 2076785950,21011123423,226708386212,2598075587529,31509529248585,

%U 403155101535686,5426659537490872,76655160760249052,1133766220709242638,17522418780011531368,282452568669871514771,4740645804610572971112

%N Number of 4-regular multigraphs on n unlabeled nodes with 4 external legs, loops allowed.

%Y Cf. A129429, A361698 (connected).

%K nonn

%O 1,2

%A _Andrew Howroyd_, Mar 21 2023