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%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
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