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A002490 Theta series of 27-dimensional unimodular lattice with root system A_1 and a parity vector of norm 3. 0
1, 0, 2, 1652, 119550 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

REFERENCES

R. Bacher and B. B. Venkov, Reseaux entiers unimodulaires sans racine en dimension 27 et 28, in Reseaux euclidiens, designs spheriques et formes modulaires, pp. 212-267, Enseignement Math., Geneva, 2001.

LINKS

Table of n, a(n) for n=0..4.

R. Bacher and B. B. Venkov, Reseaux entiers unimodulaires sans racine en dimension 27 et 28 (html, ps).

CROSSREFS

Sequence in context: A201242 A062585 A239505 * A179961 A160224 A129061

Adjacent sequences:  A002487 A002488 A002489 * A002491 A002492 A002493

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified February 13 07:39 EST 2016. Contains 268247 sequences.