OFFSET
1,2
LINKS
Vaclav Kotesovec, Table of n, a(n) for n = 1..200
FORMULA
a(n) ~ c * n^n, where c = 1/(1 - 3/exp(1) + 3/exp(2) - 1/exp(3)) = 3.959134481...
MATHEMATICA
Table[Sum[Sum[Sum[j^n, {j, 1, k}], {k, 1, m}], {m, 1, n}], {n, 1, 20}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, Nov 08 2021
STATUS
approved