OFFSET
1,2
FORMULA
a(n) = Sum_{k=1..n} (2*k-1)^n.
a(n) ~ 2^n * n^n / (exp(1/2) - exp(-1/2)). - Vaclav Kotesovec, Dec 09 2021
MATHEMATICA
Table[Sum[(2*k-1)^n, {k, 1, n}], {n, 1, 20}] (* Vaclav Kotesovec, Dec 09 2021 *)
PROG
(PARI) a(n) = sum(k=1, n, (2*k-1)^n);
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Dec 09 2021
STATUS
approved