login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Theta series of 10-dimensional lattice (C6 X SU(4,2)):C2 with minimal norm 4.
1

%I #24 Jun 01 2024 11:51:38

%S 1,0,270,960,3240,8640,17790,25920,62910,81600,124416,198720,287160,

%T 311040,596700,619200,806760,1140480,1465710,1425600,2458080,2383680,

%U 2903040,3818880,4607790,4250880,7089660,6518400,7575120,9633600,11275776,10082880,16150590,14587200,16588800,20442240,23261640,20424960

%N Theta series of 10-dimensional lattice (C6 X SU(4,2)):C2 with minimal norm 4.

%H G. Nebe and N. J. A. Sloane, <a href="http://www.math.rwth-aachen.de/~Gabriele.Nebe/LATTICES/P10.1.html">Home page for this lattice</a>

%F See Magma program.

%o (Magma)

%o A:=Matrix([[4, 1, 1, -2, 1, -2, -2, -2, 2, -2], [1, 4, 0, -1, 2, 1, 0, 0, 2, -2], [1, 0, 4, 1, 2, -2, 1, 1, 2, 1], [-2, -1, 1, 4, -1, 1, 2, 1, -1, 2], [1, 2, 2, -1, 4, -1, 1, 1, 2, 0], [-2, 1, -2, 1, -1, 4, 0, 1, -1, 0], [-2, 0, 1, 2, 1, 0, 4, 2, -1, 1], [-2, 0, 1, 1, 1, 1, 2, 4, -1, 2], [2, 2, 2, -1, 2, -1, -1, -1, 4, -1], [-2, -2, 1, 2, 0, 0, 1, 2, -1, 4]]);

%o L:=LatticeWithGram(A);

%o T<q>:=ThetaSeries(L, 75);

%o S:=[];

%o for i in [0 .. 37] do S cat:= [Coefficient(T, 2*i)]; end for;

%o S; // _Josiah Park_, Feb 24 2019

%K nonn

%O 0,3

%A _N. J. A. Sloane_.

%E More terms from _Josiah Park_, Feb 24 2019