Number of isomorphism classes of connected 3-regular loopless multigraphs of order 2n.
1, 2, 6, 20, 91, 509, 3608, 31856, 340416, 4269971, 61133757, 97809899
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Fri Oct 29 05:35:16 CEST 2010 [seqfan] Implementing first 500 sequences in Java