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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
OFFSET
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
KEYWORD
nonn
STATUS
approved