OFFSET
0,2
FORMULA
a(n) ~ exp(Pi*sqrt(n/3)) * 2^(2*n - 3/2) / sqrt(Pi*n).
a(n) = Sum_{j=0..n} A325949(j)*4^(n-j).
MATHEMATICA
nmax = 30; CoefficientList[Series[1/(1-x)^(1/2) * Product[(1+x^k), {k, 1, nmax}], {x, 0, nmax}], x] * 4^Range[0, nmax]
CROSSREFS
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, May 28 2019
STATUS
approved