OFFSET
0,2
LINKS
Colin Barker, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (20,-143,436,-480).
FORMULA
a(n) = (8^(n+3) - 10*5^(n+3) + 15*4^(n+3) - 6*3^(n+3))/60. - Yahia Kahloune, May 25 2013
a(n) = 20*a(n-1) - 143*a(n-2) + 436*a(n-3) - 480*a(n-4) for n > 3. - Colin Barker, Oct 23 2019
E.g.f.: exp(3*x)*(256*exp(5*x) - 625*exp(2*x) + 480*exp(x) - 81)/30. - Stefano Spezia, Sep 29 2022
MATHEMATICA
CoefficientList[Series[1/((1 - 3x)(1 - 4x)(1 - 5x)(1 - 8x)) , {x, 0, 29}], x] (* Alonso del Arte, Oct 25 2019 *)
PROG
(PARI) Vec(1 / ((1 - 3*x)*(1 - 4*x)*(1 - 5*x)*(1 - 8*x)) + O(x^20)) \\ Colin Barker, Oct 23 2019
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved