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 A053596 #14 Mar 22 2022 19:10:20
%S A053596 0,0,8,8,32,56,136,160,280,360,552,672,912,1088,1472,1736,2176,2512,
%T A053596 3112,3544,4224,4776,5616,6272,7208,8144,9328,10144,11536,12712,14328,
%U A053596 15408,17256,18656,20672,22400,24464,26344,28768,30976,33552
%N A053596 Open 3-dimensional ball numbers (version 4): a(n) is the number of integer points (i,j,k) contained in an open ball of diameter n, centered at (1/2, 1/2, 1/2).
%C A053596 Lim_{n->infinity} a(n)/(n/2)^3 -> (4/3)*Pi.
%F A053596 a(n) = [x^(n^2)] theta_2(x^4)^3 / (1 - x). - _Ilya Gutkovskiy_, Nov 23 2021
%Y A053596 Cf. A053415.
%K A053596 easy,nonn
%O A053596 0,3
%A A053596 Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Jan 19 2000