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 A140595 #16 Jun 27 2021 12:34:34 %S A140595 1,2,3,4,5,6,7,9,8,11,10,13,14,12,15,16,18,19,17,21,23,22,20,25,26,24, %T A140595 27,28,29,30,31,32,33,34,35,37 %N A140595 A140485 read by columns. %K A140595 nonn,more,uned %O A140595 0,2 %A A140595 _Paul Curtz_, Jul 07 2008