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Search: id:A038080
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A038080 Number of identity trees with 3-colored nodes. +0
4
1, 3, 3, 9, 39, 189, 981, 5490, 31674, 189954, 1170126, 7382745, 47494197, 310712808, 2061987642, 13855192866, 94113385437, 645424668666, 4464027720900, 31110200069511, 218292811705458, 1541172223659249 (list; graph; listen)
OFFSET

0,2

LINKS

Index entries for sequences related to trees

FORMULA

G.f.: B(x)-B^2(x)/2-B(x^2)/2, where B(x) is g.f. for A038079.

CROSSREFS

Cf. A000220. A038077-A038079.

Sequence in context: A029857 A032086 A100239 this_sequence A115564 A122961 A165421

Adjacent sequences: A038077 A038078 A038079 this_sequence A038081 A038082 A038083

KEYWORD

nonn

AUTHOR

Christian G. Bower (bowerc(AT)usa.net), Jan 04 1999.

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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