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 A056948 #10 May 18 2022 21:30:38
%S A056948 1,0,0,-2,26,0,0,32560,130812,0,0,3671562,9174424,0,0,95675472,
%T A056948 188233758,0,0,1142977594,1959731160,0,0,8506658544,13293118872,0,0,
%U A056948 45762829976,67073331776,0,0,195388726752,272567835540,0,0,698077270836,938806082418,0,0,2176652437872
%N A056948 Jacobi form of weight 12 and index 1 associated with a nonexistent Niemeier lattice of Coxeter number 1.
%C A056948 a(3) < 0 (apparently the only negative term) so the lattice cannot exist.
%C A056948 a(4n) + 2*Sum_{r=1..floor(sqrt(4n))} a(4*n - r^2) = A056947(n).
%D A056948 Eichler and Zagier, The Theory of Jacobi Forms, Birkhauser 1985
%F A056948 E_8 * E_{4, 1} + (2*h - 60) * E_{12, 1} where h = 1.
%F A056948 a(n) = A055747(n) - 58*A003785(n). - _Sean A. Irvine_, May 18 2022
%Y A056948 Cf. A003785, A055747, A056947.
%K A056948 sign
%O A056948 0,4
%A A056948 Kok Seng Chua (chuaks(AT)ihpc.nus.edu.sg), Jul 17 2000