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A036587 Number of binary rooted trees with n nodes and height at most 4. 1
1, 1, 1, 2, 3, 5, 6, 8, 8, 9, 7, 7, 4, 3, 1, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,4
LINKS
E. M. Rains and N. J. A. Sloane, On Cayley's Enumeration of Alkanes (or 4-Valent Trees), J. Integer Sequences, Vol. 2 (1999), Article 99.1.1.
CROSSREFS
Sequence in context: A269670 A333480 A373600 * A075145 A086142 A258334
KEYWORD
nonn,fini,full
AUTHOR
STATUS
approved

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Last modified June 23 10:04 EDT 2024. Contains 373629 sequences. (Running on oeis4.)