This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A361446 #11 Mar 13 2023 13:29:27 %S A361446 1,3,16,99,717,5964,56701,611750,7432491,100838222,1514749135, %T A361446 24989362186,449429188211,8754181791029,183621843677724, %U A361446 4126714250580949,98932328702693666,2520187379996442269,67980528958530199837,1935753445850303203221,58025998739501873764826 %N A361446 Number of connected 3-regular multigraphs on 2n unlabeled nodes rooted at an oriented edge (or loop), loops allowed. %C A361446 a(0) = 1 by convention. Loops add two to the degree of a node. %F A361446 G.f.: B(x)/C(x) where B(x) is the g.f. of A352175 and C(x) is the g.f. of A129427. %Y A361446 A352174 is the 4-regular version. %Y A361446 Cf. A005967 (unrooted), A129427, A352175, A361412 (rooted at unoriented edge), A361447, A361448. %K A361446 nonn %O A361446 0,2 %A A361446 _Andrew Howroyd_, Mar 12 2023