OFFSET
0,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..1000
FORMULA
G.f.: -240*x^2*(x+1)*(x^4+17*x^3+48*x^2+17*x+1)/(x-1)^9.
a(n) = n^8-n^4.
From Amiram Eldar, Jan 12 2021: (Start)
Sum_{n>=2} 1/a(n) = 15/8 - Pi^4/90 - Pi*coth(Pi)/4.
MAPLE
a:= n-> (n^4-1)*n^4:
seq(a(n), n=0..30);
MATHEMATICA
Table[n^8 - n^4, {n, 0, 30}] (* Wesley Ivan Hurt, Mar 30 2017 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Alois P. Heinz, Oct 21 2012
STATUS
approved