OFFSET
1,1
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..10000
FORMULA
G.f.: Sum_{k>0} binomial(k+4,4) * x^k/(1 - x^k).
a(n) = Sum_{d|n} binomial(d+4,4).
MATHEMATICA
a[n_] := DivisorSum[n, Binomial[# + 4, 4] &]; Array[a, 40] (* Amiram Eldar, Jul 05 2023 *)
PROG
(PARI) a(n) = sumdiv(n, d, binomial(d+4, 4));
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Seiichi Manyama, Jun 16 2023
STATUS
approved