OFFSET
0,2
COMMENTS
To find Y values: b(n) = c(n)*(-1+d(n)) which gives: 0, 56, 53760, 48380584, 43448832000,...
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..335
FORMULA
a(n) = c(n)*(1+d(n)) with c(0) = 0, c(1) = 4 and c(n) = 30*c(n-1) - c(n-2), d(0) = 1, d(1) = 15 and d(n) = 30*d(n-1) - d(n-2).
From Max Alekseyev, Nov 13 2009: (Start)
a(n) = 2*A123393(n)
For n>=4, a(n) = 928*a(n-1) - 26942*a(n-2) + 928*a(n-3) - a(n-4).
O.g.f.: 16*x*(4*x^2 -337*x +4)/((x^2 -30*x +1)*(x^2 -898*x +1)). (End)
MATHEMATICA
CoefficientList[Series[16*x*(4*x^2 - 337*x + 4)/(x^2 - 30*x + 1)/(x^2 - 898*x + 1), {x, 0, 50}], x] (* G. C. Greubel, Oct 13 2017 *)
PROG
(PARI) x='x+O('x^50); concat([0], Vec(16*x*(4*x^2 -337*x +4)/((x^2 -30*x +1)*(x^2 -898*x +1)))) \\ G. C. Greubel, Oct 13 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Mohamed Bouhamida, Oct 14 2006
EXTENSIONS
More terms from Max Alekseyev, Nov 13 2009
STATUS
approved