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A023932 Theta series of A*_20 lattice. 0
1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 42, 0, 0, 0, 0, 0, 0, 0, 0, 420, 0, 420, 0, 0, 0, 0, 0, 2660, 0, 0, 0, 7980, 0, 0, 11970, 0, 0, 0, 0, 0, 88620, 0, 35910, 0, 0, 108528, 0, 0, 204330, 232560, 0, 0, 814800, 0, 587860, 1364580, 0, 0, 0, 0, 0, 3319680, 0, 1093260, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,11

REFERENCES

J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 114.

LINKS

Table of n, a(n) for n=0..64.

Kok Seng Chua, The Root Lattice A*n and Ramanujan's Circular Summation of Theta Functions, Proc. Amer. Math. Soc. 130 (2002), 1-8.

CROSSREFS

Sequence in context: A125194 A237639 A095189 * A243831 A022074 A335188

Adjacent sequences:  A023929 A023930 A023931 * A023933 A023934 A023935

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

EXTENSIONS

More terms from Sean A. Irvine, Jul 15 2020

STATUS

approved

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Last modified August 1 17:43 EDT 2021. Contains 346402 sequences. (Running on oeis4.)