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%I #7 Feb 25 2023 18:07:12
%S 0,0,2,4,9,20,44,113,329,1044,3622,13544,53596,223084,969158
%N Number of unlabeled nonseparable (or 2-connected) multigraphs with n edges and degree >= 3 at each node, loops allowed.
%C A single-edge is considered to be nonseparable here.
%e The a(3) = 2 multigraphs are:
%e - a triple edge;
%e - a single edge with a loop at each vertex.
%Y Row sums of A360870.
%Y Cf. A002935, A360863, A360867.
%K nonn,more
%O 1,3
%A _Andrew Howroyd_, Feb 25 2023