%I A002273
%S A002273 1,0,98280,19138560,805208040,14651449344,156717687840,
%T A002273 1162883174400,6596666916840,30507984568320,119992701299184,
%U A002273 414348381296640,1283840894706720,3635166831206400,9523995863722560
%N A002273 Theta series of 28-dimensional Quebbemann lattice.
%C A002273 This lattice has the highest possible density of any 28-dimensional even 
               lattice of level at most 2.
%C A002273 Numbers so far are also terms of A002520. - R. Stephan, Aug 23 2004
%D A002273 H.-G. Quebbemann, Modular lattices in Euclidean spaces, J. Number Theory, 
               54 (1995), 190-202.
%e A002273 1 + 98280*q^2 + 19138560*q^3 + 805208040*q^4 + 14651449344*q^5 + 156717687840*q^6 
               + ...
%Y A002273 Sequence in context: A145659 A022214 A109185 this_sequence A093214 A052090 
               A163679
%Y A002273 Adjacent sequences: A002270 A002271 A002272 this_sequence A002274 A002275 
               A002276
%K A002273 nonn,nice,easy
%O A002273 0,3
%A A002273 N. J. A. Sloane (njas(AT)research.att.com).