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A015677 Expansion of e.g.f. theta_3^(21/2). 1
1, 21, 399, 6783, 102249, 1370565, 16991415, 216411615, 3146775345, 49819225365, 767467173375, 11808542505375, 208290421179225, 4084751136190725, 76593243172220775, 1426967042034909375 (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

Seiichi Manyama, Table of n, a(n) for n = 0..445

MATHEMATICA

nmax = 25; CoefficientList[Series[EllipticTheta[3, 0, x]^(21/2), {x, 0, nmax}], x] * Range[0, nmax]! (* Vaclav Kotesovec, Oct 23 2018 *)

CROSSREFS

Sequence in context: A296723 A145613 A212786 * A285396 A113363 A223459

Adjacent sequences:  A015674 A015675 A015676 * A015678 A015679 A015680

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified October 17 13:16 EDT 2021. Contains 348048 sequences. (Running on oeis4.)