3,2

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

E. M. Palmer and R. C. Read, on the number of plane 2-trees, J. Lond. Math. Soc., 6 (1973), 583-592.

Index entries for sequences related to trees

Sequence in context: A112487 A089469 A111265 this_sequence A006679 A050390 A101878

Adjacent sequences: A003090 A003091 A003092 this_sequence A003094 A003095 A003096

nonn

N. J. A. Sloane (njas(AT)research.att.com).