Voozh

A107389

Expansion of x*(1-6*x+7*x^2)/((1-x)*(1+x)*(1-5*x+x^2)).

0, 1, -1, 2, 5, 31, 144, 697, 3335, 15986, 76589, 366967, 1758240, 8424241, 40362959, 193390562, 926589845, 4439558671, 21271203504, 101916458857, 488311090775, 2339638995026, 11209883884349, 53709780426727, 257339018249280, 1232985310819681, 5907587535849119

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,4

LINKS

Table of n, a(n) for n=0..26.

Index entries for linear recurrences with constant coefficients, signature (5,0,-5,1).

FORMULA

a(n)-a(n-2) = A030221(n-3), n>2. - R. J. Mathar, Dec 17 2017

MATHEMATICA

LinearRecurrence[{5, 0, -5, 1}, {0, 1, -1, 2}, 30] (* Harvey P. Dale, Sep 17 2020 *)

PROG

(PARI) concat(0, Vec((1-6*x+7*x^2)/(1-x)/(1+x)/(1-5*x+x^2)+O(x^98))) \\ Charles R Greathouse IV, Jan 25 2012