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A036610 Number of 4-ary rooted trees with n nodes and height at most 5. 0
1, 1, 1, 2, 4, 9, 18, 39, 80, 165, 331, 664, 1307, 2569, 4983, 9624, 18416, 35060, 66218, 124411, 232138, 430783, 794431, 1457063, 2656709, 4817940, 8688296, 15584381, 27802598, 49340196, 87100640, 152968396, 267264610, 464600889 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..33.

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: A018000 A329668 A320222 * A219755 A289846 A193201

Adjacent sequences:  A036607 A036608 A036609 * A036611 A036612 A036613

KEYWORD

nonn,fini

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified May 26 17:40 EDT 2020. Contains 334630 sequences. (Running on oeis4.)