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 A022047 #15 Oct 16 2018 08:37:36 %S A022047 1,480,29152,525952,3994080,18626112,67978880,197120256,509145568, %T A022047 1143441760,2428524096,4658843520,8705492608,15000919872,25593401600, %U A022047 40864033536,65187410400,98098623936,148724365664,213678303360,310833534528,430766443520,605650030464,813970121472 %N A022047 Theta series of D_16 lattice. %D A022047 J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 118. %H A022047 Seiichi Manyama, <a href="/A022047/b022047.txt">Table of n, a(n) for n = 0..10000</a> %t A022047 terms = 18; s = EllipticTheta[3, 0, x]^16 + O[x]^(2 terms); Partition[ CoefficientList[s, x], 2][[All, 1]][[1 ;; terms]] (* _Jean-François Alcover_, Jul 06 2017 *) %Y A022047 a(n) = A000152(2*n). %K A022047 nonn %O A022047 0,2 %A A022047 _N. J. A. Sloane_ %E A022047 More terms from _Seiichi Manyama_, Oct 16 2018