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A007038 Theta series of 20-dimensional lattice R_20 with det 1024 and minimal norm 4. 1
1, 0, 3960, 168960, 2094840, 16625664 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

A034599 is almost certainly the same sequence. That will follow if R_20 is a 2-modular lattice. - N. J. A. Sloane, Sep 23 2019

LINKS

Table of n, a(n) for n=0..5.

C. Bachoc, Voisinage au sens de Kneser pour les réseaux quaternioniens, Comment. Math. Helvetici 70 (1995), 350-374.

C. Bachoc and G. Nebe, Classification of two genera of 32-dimensional lattices of rank 8 over the Hurwitz order, Experiment. Math. 6 (1997), 151-162.

G. Nebe and N. J. A. Sloane, Home page for this lattice

CROSSREFS

Cf. A034599.

Sequence in context: A230617 A250531 A319800 * A034599 A222783 A107540

Adjacent sequences:  A007035 A007036 A007037 * A007039 A007040 A007041

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified January 26 03:23 EST 2022. Contains 350572 sequences. (Running on oeis4.)