309439942

Appears in sequences

• Number of isomorphism classes of connected 3-regular loopless multigraphs with n vertices and with semi-edges allowed.at n=17A243391
• Number of isomorphism classes of connected 3-regular simple graphs of order 2n with loops and semi-edges allowed.at n=17A243392
• Number of unlabeled connected loopless multigraphs with n nodes of degree 3 or less and with single or double edges.at n=18A303030