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A023930 Theta series of A*_18 lattice. 0
1, 0, 0, 0, 0, 0, 0, 0, 0, 38, 0, 0, 0, 0, 0, 0, 0, 342, 0, 342, 0, 0, 0, 0, 1938, 0, 0, 0, 5814, 0, 7752, 0, 0, 0, 0, 23256, 31046, 0, 23256, 54264, 0, 0, 100776, 116964, 151164, 184756, 0, 233244, 0, 331398, 0, 0, 0, 0, 736440, 825588, 0, 548454, 1325592, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,10

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..59.

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: A238840 A329226 A171407 * A022072 A154229 A225433

Adjacent sequences:  A023927 A023928 A023929 * A023931 A023932 A023933

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 July 26 20:34 EDT 2021. Contains 346295 sequences. (Running on oeis4.)