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 A006917 M5485 #16 Jun 16 2021 21:04:52
%S A006917 1,0,906,6144,38424,102400,359344,651264,1743434,2596864,5956560,
%T A006917 7829504,16232208,19574784,37960640,43102208,78860184,85909504,
%U A006917 150986202,157845504,269942480,274096128,454718160,452882432,734667440,714375168
%N A006917 Theta series of laminated lattice LAMBDA_13^{max}.
%D A006917 J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 157.
%D A006917 E. C. Pervin, personal communication.
%D A006917 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H A006917 Andy Huchala, <a href="/A006917/b006917.txt">Table of n, a(n) for n = 0..20000</a>
%o A006917 (Magma)
%o A006917 L := Lattice("Lambda",13);
%o A006917 B := Basis(ThetaSeriesModularFormSpace(L),20);
%o A006917 Coefficients(B[1]+906*B[3]+6144*B[4]+38424*B[5]+102400*B[6]+359344*B[7]); // _Andy Huchala_, Jun 16 2021
%K A006917 nonn
%O A006917 0,3
%A A006917 _N. J. A. Sloane_