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Table of n, a(n) for n=0..20.
G. Labelle, C. Lamathe and P. Leroux, Labeled and unlabeled enumeration of k-gonal 2-trees
Sequence in context: A074187 A111883 A245155 * A203716 A136793 A274889
Adjacent sequences: A094634 A094635 A094636 * A094638 A094639 A094640
Vladeta Jovovic, Jun 06 2004