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A055335 Number of asymmetric (identity) trees with n nodes and 4 leaves. 1
1, 3, 8, 14, 25, 40, 62, 89, 127, 173, 233, 304, 393, 497, 624, 769, 942, 1139, 1369, 1627, 1925, 2257, 2635, 3053, 3524, 4042, 4621, 5253, 5954, 6717, 7557, 8466, 9462, 10536, 11706, 12963, 14326, 15786, 17363, 19046, 20857, 22786, 24854 (list; graph; refs; listen; history; text; internal format)
OFFSET

9,2

LINKS

Table of n, a(n) for n=9..51.

Index entries for sequences related to trees

FORMULA

G.f.: x^9(-x^3+2x^2+x+1)/[(1+x^2)(1-x^3)(1-x^2)^2(1-x)^2].

CROSSREFS

Column 4 of A055334.

Sequence in context: A082474 A245181 A241563 * A123329 A268191 A169929

Adjacent sequences:  A055332 A055333 A055334 * A055336 A055337 A055338

KEYWORD

nonn

AUTHOR

Christian G. Bower, May 12 2000

STATUS

approved

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Last modified February 22 14:58 EST 2017. Contains 282487 sequences.