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 A015673 #10 Oct 23 2018 07:10:30
%S A015673 1,15,195,2145,19665,158535,1447875,18243225,232985025,2435846175,
%T A015673 28443399075,508347464625,8431258460625,109007191668375,
%U A015673 1781609910955875,40590985621811625,792811219265690625
%N A015673 Expansion of e.g.f. theta_3^(15/2).
%D A015673 J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 102.
%H A015673 Seiichi Manyama, <a href="/A015673/b015673.txt">Table of n, a(n) for n = 0..446</a>
%t A015673 nmax = 25; CoefficientList[Series[EllipticTheta[3, 0, x]^(15/2), {x, 0, nmax}], x] * Range[0, nmax]! (* _Vaclav Kotesovec_, Oct 23 2018 *)
%K A015673 nonn
%O A015673 0,2
%A A015673 _N. J. A. Sloane_