OFFSET
0,2
FORMULA
a(n) ~ Pi^(9/8) * 2^(7*n - 5/4) / (Gamma(1/4)^(7/2) * n^(3/2)).
MATHEMATICA
nmax = 20; CoefficientList[Series[Hypergeometric2F1[1/4, 1/4, 1, 64*x]^(1/4), {x, 0, nmax}], x] * 2^Range[0, nmax]
CROSSREFS
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, Apr 10 2018
STATUS
approved