A077902 Expansion of (1-x)^(-1)/(1 + x - x^2 + x^3).

1, 0, 2, -2, 5, -8, 16, -28, 53, -96, 178, -326, 601, -1104, 2032, -3736, 6873, -12640, 23250, -42762, 78653, -144664, 266080, -489396, 900141, -1655616, 3045154, -5600910, 10301681, -18947744, 34850336, -64099760, 117897841, -216847936, 398845538, -733591314, 1349284789, -2481721640

Offset: 0

Author

N. J. A. Sloane, Nov 17 2002

Keywords

• sign
• easy

Links

• Index entries for linear recurrences with constant coefficients, signature (0,2,-2,1)

Programs

Mathematica

a=0; b=0; c=0; lst={}; Do[z=a+b+c+1; AppendTo[lst,z]; a=b; b=c; c=z; z=a+b+c-1; AppendTo[lst,z]; a=b; b=c; c=z,{n,5!}]; lst(*Abs values*) (* Vladimir Joseph Stephan Orlovsky, Feb 17 2010 *)

PARI

Vec((1-x)^(-1)/(1+x-x^2+x^3)+O(x^99)) \\ Charles R Greathouse IV, Sep 26 2012