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%I #24 May 08 2020 19:02:55
%S 1,1,4,9,37,146,772,4449,30307,228605,1921464,17652327,176162548,
%T 1893738334,21806975279,267636988052,3486370839295,48029272657002,
%U 697542580286159,10649954607360119,170508064788069346,2856122791685125616,49951625299057923405
%N Number of unlabeled connected loopless multigraphs with n nodes of degree 4 or less.
%o (nauty/bash) geng -c -D4 ${n} -q | multig -D4 -u
%Y Column k=4 of A334546.
%Y Cf. A121941 (single edges only), A134818 (with no more than triple edges), A289158 (with no more than double edges).
%Y Cf. A243391 (degree 3 or less).
%K nonn
%O 0,3
%A _Natan Arie Consigli_, Jul 04 2017
%E a(18)-a(22) from _Andrew Howroyd_, Mar 20 2020
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