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A036622 Number of 6-ary rooted trees with n nodes and height at most 5. +0
2
1, 1, 1, 2, 4, 9, 19, 42, 88, 188, 393, 821, 1692, 3483, 7101, 14436, 29162, 58703, 117577, 234695, 466493, 924149, 1824100, 3588957, 7038072, 13760324, 26821365, 52130255, 101033183, 195279030, 376427128, 723731809, 1387917803, 2655019934 (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.

Index entries for sequences related to rooted trees

CROSSREFS

Sequence in context: A122584 A141015 A078039 this_sequence A001384 A089941 A127681

Adjacent sequences: A036619 A036620 A036621 this_sequence A036623 A036624 A036625

KEYWORD

nonn,fini

AUTHOR

njas

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Last modified July 19 08:04 EDT 2008. Contains 142098 sequences.


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