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 A048807 #5 Dec 19 2015 13:11:42 %S A048807 1,2,1,4,4,1,8,12,6,1,9,16,12,4,1,22,45,40,20,10,1,54,132,135,80,60, %T A048807 12,1,128,378,462,315,280,84,14,1,83,256,378,308,315,112,28,4,1,70, %U A048807 249,384,378,462,189,56,12,6,1,184,700,1245,1280,1890,924,315,80,60 %N A048807 Matrix square of A048804. %e A048807 1; 2,1; 4,4,1; 8,12,6,1; ... %K A048807 nonn,tabl %O A048807 0,2 %A A048807 _Christian G. Bower_, Apr 15 1999