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A002273 Theta series of 28-dimensional Quebbemann lattice. 0
1, 0, 98280, 19138560, 805208040, 14651449344, 156717687840, 1162883174400, 6596666916840, 30507984568320, 119992701299184, 414348381296640, 1283840894706720, 3635166831206400, 9523995863722560 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

This lattice has the highest possible density of any 28-dimensional even lattice of level at most 2.

Numbers so far are also terms of A002520. - Ralf Stephan, Aug 23 2004

LINKS

Table of n, a(n) for n=0..14.

H.-G. Quebbemann, Modular lattices in Euclidean spaces, J. Number Theory, 54 (1995), 190-202.

EXAMPLE

1 + 98280*q^2 + 19138560*q^3 + 805208040*q^4 + 14651449344*q^5 + 156717687840*q^6 + ...

CROSSREFS

Sequence in context: A253823 A316488 A235196 * A268819 A236639 A093214

Adjacent sequences:  A002270 A002271 A002272 * A002274 A002275 A002276

KEYWORD

nonn,nice,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified April 18 02:16 EDT 2021. Contains 343072 sequences. (Running on oeis4.)