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A004673 Theta series of extremal even unimodular lattice in dimension 56. 1
1, 0, 0, 15590400, 36957286800, 15284192071680, 2099603881267200, 134803322124134400, 4960017097962973200, 119289241340847513600, 2051414989573311774720, 26894038407511734144000, 281804009505443595441600 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

REFERENCES

J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 195.

LINKS

Table of n, a(n) for n=0..12.

N. Heninger, E. M. Rains and N. J. A. Sloane, On the Integrality of n-th Roots of Generating Functions, J. Combinatorial Theory, Series A, 113 (2006), 1732-1745.

CROSSREFS

Sequence in context: A207797 A186050 A121840 * A290385 A058909 A179585

Adjacent sequences:  A004670 A004671 A004672 * A004674 A004675 A004676

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified August 19 08:57 EDT 2017. Contains 290794 sequences.