OFFSET
0,2
FORMULA
a(n) ~ 4^n / (QPochhammer[1/4] * sqrt(Pi*n)).
MATHEMATICA
Table[Sum[PartitionsP[n-k]*Binomial[2*k, k], {k, 0, n}], {n, 0, 25}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, May 19 2018
STATUS
approved