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 A022049 #12 Oct 16 2018 10:09:31 %S A022049 1,612,48996,1207680,12573540,73617480,318102912,1090632960, %T A022049 3176573796,8148505828,18918517320,40578145920,81375600000, %U A022049 154398101832,279331331328,484986858240,812932819812,1320330798792,2085523894756,3214498469760,4845373383240,7157876711424,10386510802560 %N A022049 Theta series of D_18 lattice. %D A022049 J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 118. %H A022049 Seiichi Manyama, <a href="/A022049/b022049.txt">Table of n, a(n) for n = 0..1000</a> %t A022049 terms = 18; f[q_] = LatticeData["D18", "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 A022049 nonn %O A022049 0,2 %A A022049 _N. J. A. Sloane_ %E A022049 More terms from _Seiichi Manyama_, Oct 16 2018