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 A091700 #6 May 04 2023 06:09:23 %S A091700 1,2,1,7,6,1,23,29,10,1,78,127,67,14,1,264,527,375,121,18,1,895,2113, %T A091700 1892,831,191,22,1,3034,8269,8922,4973,1559,277,26,1,10286,31781, %U A091700 40115,27139,10826,2623,379,30,1,34872,120448,174080,138617,67308,20763,4087,497,34,1 %N A091700 Matrix square of triangle A063967. %e A091700 1; %e A091700 2, 1; %e A091700 7, 6, 1; %e A091700 23, 29, 10, 1; %e A091700 78, 127, 67, 14, 1; %e A091700 ... %Y A091700 Row sums: A091701. %Y A091700 Column 0: A091702. %K A091700 nonn,tabl %O A091700 0,2 %A A091700 _Christian G. Bower_, Jan 29 2004