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 A022052 #12 Oct 16 2018 12:00:00 %S A022052 1,840,95802,3504816,55350120,465944304,2610853840,11337146784, %T A022052 40208417466,123411903160,335056780464,830096613360,1893781702512, %U A022052 4058779021584,8190877926720,15805879161632,29122237029480,51905458442208,89163973663338,149313692762640,242598110651568 %N A022052 Theta series of D_21 lattice. %D A022052 J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 118. %H A022052 Seiichi Manyama, <a href="/A022052/b022052.txt">Table of n, a(n) for n = 0..1000</a> %t A022052 terms = 17; f[q_] = LatticeData["D21", "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 A022052 nonn,easy %O A022052 0,2 %A A022052 _N. J. A. Sloane_ %E A022052 More terms from _Seiichi Manyama_, Oct 16 2018