OFFSET
0,3
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..1000
FORMULA
G.f.: Product_{n>=1} (1 - x^n)^(n^5).
a(n) = -(1/n)*Sum_{k=1..n} sigma_6(k)*a(n-k).
MATHEMATICA
a[n_] := If[n<1, 1, -(1/n) * Sum[DivisorSigma[6, k] a[n - k], {k, n}]]; Table[a[n], {n, 0, 22}] (* Indranil Ghosh, Mar 16 2017 *)
PROG
(PARI) a(n) = if(n<1, 1, -(1/n) * sum(k=1, n, sigma(k, 6) * a(n - k)));
for(n=0, 22, print1(a(n), ", ")) \\ Indranil Ghosh, Mar 16 2017
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Mar 05 2017
STATUS
approved