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 A015671 #10 Oct 23 2018 07:19:23
%S A015671 1,11,99,693,3729,22275,259875,2900205,19490625,161008155,3451399875,
%T A015671 48646261125,433937559825,6657275099475,145157601463875,
%U A015671 2607210889408125,38347348433018625,476849547788488875
%N A015671 Expansion of e.g.f. theta_3^(11/2).
%D A015671 J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 102.
%H A015671 Seiichi Manyama, <a href="/A015671/b015671.txt">Table of n, a(n) for n = 0..447</a>
%t A015671 nmax = 25; CoefficientList[Series[EllipticTheta[3, 0, x]^(11/2), {x, 0, nmax}], x] * Range[0, nmax]! (* _Vaclav Kotesovec_, Oct 23 2018 *)
%K A015671 nonn
%O A015671 0,2
%A A015671 _N. J. A. Sloane_