2,3

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

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

F. Harary, A. Mowshowitz and J. Riordan, Labeled trees with unlabeled end-points, J. Combin. Theory, 6 (1969), 60-64.

Index entries for sequences related to trees

Cf. A151880.

Sequence in context: A020112 A143917 A009326 this_sequence A124373 A010787 A008933

Adjacent sequences: A001255 A001256 A001257 this_sequence A001259 A001260 A001261

nonn,nice

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