OFFSET
0,3
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..214
FORMULA
G.f.: Product_{k>=1} 1/(1 - x^k)^(k^(2*k)).
a(n) = (1/n)*Sum_{k=1..n} A283533(k)*a(n-k) for n > 0.
a(n) ~ n^(2*n) * (1 + exp(-2)/n^2). - Vaclav Kotesovec, Mar 17 2017
MATHEMATICA
A[n_] := Sum[d^(2*d + 1), {d, Divisors[n]}]; a[n_] := If[n==0, 1, (1/n)*Sum[A[k]*a[n - k], {k, n}]]; Table[a[n], {n, 0, 13}] (* Indranil Ghosh, Mar 11 2017 *)
PROG
(PARI) A(n) = sumdiv(n, d, d^(2*d + 1));
a(n) = if(n==0, 1, (1/n)*sum(k=1, n, A(k)*a(n - k)));
for(n=0, 11, print1(a(n), ", ")) \\ Indranil Ghosh, Mar 11 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Mar 11 2017
STATUS
approved