A002273 Theta series of 28-dimensional Quebbemann lattice.

1, 0, 98280, 19138560, 805208040, 14651449344, 156717687840, 1162883174400, 6596666916840, 30507984568320, 119992701299184, 414348381296640, 1283840894706720, 3635166831206400, 9523995863722560

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: A371950 A316488 A235196 * A268819 A236639 A093214

Adjacent sequences: A002270 A002271 A002272 * A002274 A002275 A002276

Keyword

nonn,nice,easy

Author

N. J. A. Sloane

Status

approved