A027439 Expansion of 1/(1 - 4*x + 5*x^2 - 3*x^3).

1, 4, 11, 27, 65, 158, 388, 957, 2362, 5827, 14369, 35427, 87344, 215348, 530953, 1309104, 3227695, 7958119, 19621313, 48377742, 119278760, 294090269, 725100502, 1787786943, 4407916069, 10868031067

Offset

0,2

Comments

Number of ordered trees with n+3 edges having on each subtree of the root exactly one node with more than one descendant. - Emeric Deutsch, Dec 11 2007

Links

Table of n, a(n) for n=0..25.

Index entries for linear recurrences with constant coefficients, signature (4, -5, 3).

Maple

G:=1/(1-4*x+5*x^2-3*x^3): Gser:=series(G, x=0, 30): seq(coeff(Gser, x, n), n=0.. 25); # Emeric Deutsch, Dec 11 2007

Crossrefs

Sequence in context: A080869 A137229 A301874 * A108985 A014151 A176759

Adjacent sequences: A027436 A027437 A027438 * A027440 A027441 A027442

Keyword

nonn

Author

N. J. A. Sloane

Status

approved