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A014970 Expansion of (theta_3 / theta_4)^3. 6
1, 12, 72, 304, 1056, 3240, 9056, 23520, 57600, 134332, 300528, 648720, 1357184, 2761800, 5482944, 10645664, 20256768, 37842264, 69511272, 125712624, 224104896, 394198912, 684799776, 1175834016, 1996991488 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 102.

LINKS

Table of n, a(n) for n=0..24.

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

Sequence in context: A008414 A052181 A118979 * A236967 A227022 A036392

Adjacent sequences:  A014967 A014968 A014969 * A014971 A014972 A014973

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified November 16 19:17 EST 2019. Contains 329201 sequences. (Running on oeis4.)