This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A015676 #10 Oct 23 2018 07:05:29
%S A015676 1,19,323,4845,63441,731595,7979715,96556005,1388717505,20396897955,
%T A015676 278955792675,4129174820925,75420709974225,1390870436830875,
%U A015676 23182616315333475,431959271726107125
%N A015676 Expansion of e.g.f. theta_3^(19/2).
%D A015676 J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 102.
%H A015676 Seiichi Manyama, <a href="/A015676/b015676.txt">Table of n, a(n) for n = 0..445</a>
%t A015676 nmax = 25; CoefficientList[Series[EllipticTheta[3, 0, x]^(19/2), {x, 0, nmax}], x] * Range[0, nmax]! (* _Vaclav Kotesovec_, Oct 23 2018 *)
%K A015676 nonn
%O A015676 0,2
%A A015676 _N. J. A. Sloane_