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Number of cubic graphs on n unlabeled nodes with half-edges.
1

%I #7 Mar 12 2020 19:00:41

%S 1,0,0,1,3,4,12,24,70,172,525,1530,5078,16994,61456,228898,895910,

%T 3617148,15130833,65084088,287828488,1304327221,6050218591,

%U 28675928883,138730847262,684300453848,3438439910436,17585597712632,91479580896616,483699938173293,2598090378779507

%N Number of cubic graphs on n unlabeled nodes with half-edges.

%C A half-edge is like a loop except it only adds 1 to the degree of its vertex.

%C a(n) is the number of simple graphs on n unlabeled nodes with every node having degree 2 or 3.

%Y Column k=3 of A333161.

%Y Cf. A005638, A110040, A186417.

%K nonn

%O 0,5

%A _Andrew Howroyd_, Mar 11 2020