A077858 Expansion of (1-x)^(-1)/(1-2*x+2*x^2-2*x^3).

1, 3, 5, 7, 11, 19, 31, 47, 71, 111, 175, 271, 415, 639, 991, 1535, 2367, 3647, 5631, 8703, 13439, 20735, 31999, 49407, 76287, 117759, 181759, 280575, 433151, 668671, 1032191, 1593343, 2459647, 3796991, 5861375, 9048063, 13967359, 21561343, 33284095, 51380223

Offset: 0

Author

N. J. A. Sloane, Nov 17 2002

Keywords

• nonn
• easy

Links

• Index entries for linear recurrences with constant coefficients, signature (3,-4,4,-2).

Crossrefs

Cf. A077943.

Programs

Mathematica

CoefficientList[Series[(1-x)^(-1)/(1-2x+2x^2-2x^3), {x,0,40}], x]  (* Harvey P. Dale, Mar 31 2011 *)

Formula

a(n)-a(n-1) = A077943(n). - R. J. Mathar, Mar 13 2021