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 A056946 #3 Feb 24 2006 03:00:00
%S A056946 1,2,0,-4,0,12,0,32728,196560,262154,0,3734484,16773120,18345916,0,
%T A056946 103029576,398034000,376741188,0,1334312620,4629381120,3937755904,0,
%U A056946 10792611336,34417656000,26962933262,0,62783799320,187489935360,138065611740,0,287105506144,814879774800
%N A056946 Coefficients of J(0)*theta_3(z) where J(0) is sequence A056945.
%C A056946 Note a(4n)=A008408(n) gives theta series of Leech lattice. a(4n+2)=0. a(3)<0, apparently the only negative term. What are a(4n+1), a(4n+3)?
%D A056946 Eichler and Zagier, The Theory of Jacobi Forms, Birkhauser, 1985.
%F A056946 (E_8*E_{4, 1}-60*E_{12, 1})*theta_3(z)
%Y A056946 Cf. A008408, A056945.
%K A056946 sign
%O A056946 0,2
%A A056946 Kok Seng Chua (chuaks(AT)ihpc.nus.edu.sg), Jul 17 2000