OFFSET
0,3
FORMULA
a(n) ~ c * d^n * (n!)^6 / sqrt(n), where
d = 12^6 * Gamma(1/3)^6 / Gamma(1/6)^12 = 1.247526211138803516951432724912344768287048859917010218640563910368330569...
c = sqrt(3*d/Pi) = 1.091466801527496975151641909038030945303075901009696629477...
MATHEMATICA
nmax = 15; CoefficientList[Series[1/Fold[(1 - #2/#1) &, 1, Reverse[Range[nmax + 1]^6*x]], {x, 0, nmax}], x]
CROSSREFS
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, Sep 23 2020
STATUS
approved