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A036626 Number of 6-ary rooted trees with n nodes and height at most 9. +0
1
1, 1, 1, 2, 4, 9, 20, 48, 114, 283, 709, 1806, 4626, 11940, 30880, 80055, 207586, 538330, 1395080, 3612756, 9346541, 24157618, 62377353, 160914843, 414737061, 1068032468, 2748211066, 7066320945, 18156540077, 46621728265, 119639668421 (list; graph; listen)
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: A034823 A036625 A003019 this_sequence A036722 A034824 A145545

Adjacent sequences: A036623 A036624 A036625 this_sequence A036627 A036628 A036629

KEYWORD

nonn,fini

AUTHOR

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

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Last modified November 24 14:25 EST 2009. Contains 167438 sequences.


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