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J. Riordan, Enumeration of trees by height and diameter, IBM J. Res. Dev. 4 (1960), 473-478.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
Table of n, a(n) for n=1..8.
Index entries for sequences related to trees
Sequence in context: A203159 A124996 A226045 * A194928 A267074 A065783
Adjacent sequences: A001849 A001850 A001851 * A001853 A001854 A001855
N. J. A. Sloane.