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A015687 Expansion of e.g.f. theta_3^(-11/2). 1
1, -11, 143, -2145, 36201, -675675, 13777335, -304008705, 7204902705, -182276917515, 4897582264575, -139156370978625, 4165687398497625, -130958825020098075, 4311426211189071975, -148272233495263502625 (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

Charles R Greathouse IV, Table of n, a(n) for n = 0..427

MATHEMATICA

nmax = 25; CoefficientList[Series[EllipticTheta[3, 0, x]^(-11/2), {x, 0, nmax}], x] * Range[0, nmax]! (* Vaclav Kotesovec, Oct 23 2018 *)

PROG

(PARI) default(seriesprecision, 16)

th3=1+Ser(sum(i=1, sqrtint(default(seriesprecision)), 2*'x^i^2))

Vec(serlaplace(th3^(-11/2))) \\ Charles R Greathouse IV, Aug 17 2017

CROSSREFS

Cf. A000122, A015671.

Sequence in context: A024140 A029529 A214098 * A051583 A225799 A027771

Adjacent sequences:  A015684 A015685 A015686 * A015688 A015689 A015690

KEYWORD

sign

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified February 18 09:57 EST 2019. Contains 320250 sequences. (Running on oeis4.)