A023932 Theta series of A*_20 lattice.

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

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