OFFSET
0,9
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..1000
N. J. A. Sloane, Transforms
FORMULA
G.f.: x + x^2 + x^3 + x^4 + x^5 + x^6 / Product_{n>=1} (1 - x^n)^a(n). - Ilya Gutkovskiy, May 08 2019
MAPLE
with(numtheory):
b:= proc(n) option remember; `if`(n=0, 1,
(add(add(d*a(d), d= divisors(j)) *b(n-j), j=1..n))/n)
end:
a:= n-> `if`(n<6, signum(n), b(n-6)):
seq(a(n), n=0..50);
CROSSREFS
KEYWORD
nonn,eigen
AUTHOR
Alois P. Heinz, Oct 18 2012
STATUS
approved