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 A015665 #12 Oct 23 2018 06:52:16
%S A015665 1,3,3,-3,81,315,-765,4725,16065,1091475,10843875,-65956275,770425425,
%T A015665 5892561675,-6512831325,213901813125,47691165146625,1318815779155875,
%U A015665 -7354191439720125,223312383805636125,2055628831852220625
%N A015665 Expansion of e.g.f. theta_3^(3/2).
%D A015665 J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 102.
%H A015665 Seiichi Manyama, <a href="/A015665/b015665.txt">Table of n, a(n) for n = 0..450</a>
%t A015665 nmax = 25; CoefficientList[Series[EllipticTheta[3, 0, x]^(3/2), {x, 0, nmax}], x] * Range[0, nmax]! (* _Vaclav Kotesovec_, Oct 23 2018 *)
%Y A015665 Cf. A015682.
%K A015665 sign
%O A015665 0,2
%A A015665 _N. J. A. Sloane_