%I A002490
%S A002490 1,0,2,1652,119550
%N A002490 Theta series of 27-dimensional unimodular lattice with root system A_1 
               and a parity vector of norm 3.
%D A002490 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.
%H A002490 R. Bacher and B. B. Venkov, Reseaux entiers unimodulaires sans racine 
               en dimension 27 et 28 (<a href="http://www-fourier.ujf-grenoble.fr/
               PREP/html/a332/a332.html">html</a>, <a href="http://www-fourier.ujf-grenoble.fr/
               cgi-bin/envoips.pl?PS=PREP/ps/t332">ps</a>).
%Y A002490 Sequence in context: A058423 A110027 A062585 this_sequence A160224 A129061 
               A011541
%Y A002490 Adjacent sequences: A002487 A002488 A002489 this_sequence A002491 A002492 
               A002493
%K A002490 nonn,more
%O A002490 0,3
%A A002490 N. J. A. Sloane (njas(AT)research.att.com).