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A055291 Number of trees with n nodes and 4 leaves. 2
1, 2, 4, 8, 14, 23, 36, 54, 78, 110, 150, 201, 264, 341, 433, 544, 674, 827, 1004, 1209, 1443, 1711, 2013, 2355, 2738, 3167, 3643, 4173, 4757, 5402, 6109, 6885, 7731, 8655, 9657, 10746, 11923, 13196, 14566, 16043, 17627, 19328, 21147, 23094 (list; graph; refs; listen; history; text; internal format)
OFFSET
5,2
LINKS
FORMULA
G.f.: x^5(x^5+x^3+1)/[(1-x^3)(1+x^2)(1-x^2)^2(1-x)^2].
CROSSREFS
Column 4 of A055290.
Sequence in context: A286522 A201347 A089054 * A091773 A107055 A202840
KEYWORD
nonn
AUTHOR
Christian G. Bower, May 09 2000
STATUS
approved

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Last modified March 19 07:18 EDT 2024. Contains 370954 sequences. (Running on oeis4.)