OFFSET
0,2
FORMULA
a(n) ~ 2^(n-1) * exp(Pi*sqrt(n/3)) / (3^(1/4) * n^(3/4)).
MATHEMATICA
Table[Sum[2^k * PartitionsQ[k], {k, 0, n}], {n, 0, 30}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, Oct 09 2017
STATUS
approved