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 A022044 #12 Oct 16 2018 08:40:20 %S A022044 1,312,11466,116688,535704,1899664,5043376,12066912,24443978,48210760, %T A022044 83323344,145532816,227110416,363737712,531517376,800145632, %U A022044 1104376728,1594656544,2114015514,2931991920,3779027408,5091783840,6365016528,8409556064,10285042352,13266026280,15994749968 %N A022044 Theta series of D_13 lattice. %D A022044 J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 118. %H A022044 Seiichi Manyama, <a href="/A022044/b022044.txt">Table of n, a(n) for n = 0..10000</a> %t A022044 terms = 20; f[q_] = LatticeData["D13", "ThetaSeriesFunction"][-I*Log[q]/Pi]; s = f[q] + O[q]^(2 terms); DeleteCases[CoefficientList[s, q], 0][[1 ;; terms]] (* _Jean-François Alcover_, Jul 06 2017 *) %K A022044 nonn %O A022044 0,2 %A A022044 _N. J. A. Sloane_ %E A022044 More terms from _Seiichi Manyama_, Oct 16 2018