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

Author

Clark Kimberling

Keywords

• nonn

Links

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

Crossrefs

Cf. A026648.

Programs

Mathematica

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

Formula

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