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A026655 T(n,0) + T(n,1) + ... + T(n,n), T given by A026648. 1
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 (list; graph; refs; listen; history; text; internal format)
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]  (* From Harvey P. Dale, Mar 15 2011 *)

CROSSREFS

Sequence in context: A135098 A136488 A045621 * A244398 A100938 A018004

Adjacent sequences:  A026652 A026653 A026654 * A026656 A026657 A026658

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified April 3 18:40 EDT 2020. Contains 333198 sequences. (Running on oeis4.)