A026655 T(n,0) + T(n,1) + ... + T(n,n), T given by A026648.

1, 2, 5, 10, 22, 44, 98, 196, 436, 872, 1940, 3880, 8632, 17264, 38408, 76816, 170896, 341792, 760400, 1520800, 3383392, 6766784, 15054368, 30108736, 66984256, 133968512, 298045760, 596091520, 1326151552, 2652303104

Offset

0,2

Links

Table of n, a(n) for n=0..29.

Index entries for linear recurrences with constant coefficients, signature (0,4,0,2)

Formula

G.f.: ((1+2x)*(1+x^2))/(1-4x^2-2x^4). - Ralf Stephan, Apr 30 2004

Mathematica

CoefficientList[Series[((1+2x)(1+x^2))/(1-4x^2-2x^4), {x, 0, 45}], x]  (* Harvey P. Dale, Mar 15 2011 *)

Crossrefs

Cf. A026648.

Sequence in context: A135098 A136488 A045621 * A336484 A244398 A100938

Adjacent sequences: A026652 A026653 A026654 * A026656 A026657 A026658

Keyword

nonn

Author

Clark Kimberling

Status

approved