OFFSET
0,2
REFERENCES
J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 102.
LINKS
Vaclav Kotesovec, A method of finding the asymptotics of q-series based on the convolution of generating functions, arXiv:1509.08708 [math.CO], Sep 30 2015, p. 11.
FORMULA
a(n) ~ exp(Pi*sqrt(3*n)) * 3^(1/4) / (16 * sqrt(2) * n^(3/4)). - Vaclav Kotesovec, Aug 28 2015
MATHEMATICA
nmax=60; CoefficientList[Series[Product[((1+x^(2*k+1))/(1-x^(2*k+1)))^6, {k, 0, nmax}], {x, 0, nmax}], x] (* Vaclav Kotesovec, Aug 28 2015 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved