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A036611 Number of 4-ary rooted trees with n nodes and height at most 6. 1
1, 1, 1, 2, 4, 9, 19, 44, 99, 226, 506, 1133, 2506, 5530, 12104, 26408, 57296, 123892, 266712, 572308, 1223488, 2607429, 5538518, 11729577, 24766121, 52143714, 109475193, 229218555, 478646764, 996885485, 2070875492, 4291068343 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Sean A. Irvine, Table of n, a(n) for n = 0..1364

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.

Index entries for sequences related to rooted trees

CROSSREFS

Sequence in context: A339156 A247623 A084083 * A316473 A316501 A036612

Adjacent sequences:  A036608 A036609 A036610 * A036612 A036613 A036614

KEYWORD

nonn,fini,full

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified October 3 04:46 EDT 2022. Contains 357230 sequences. (Running on oeis4.)