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 A091563 #2 Mar 30 2012 17:37:13 %S A091563 1,0,3,2,3,4,5,2,9,8,7,10,5,4,11,6,15,16,17,14,19,20,13,18,11,8,13,14, %T A091563 11,12,21,10,33,32,31,34,29,28,35,30,37,40,35,34,37,36,27,38,17,16,23, %U A091563 18,25,28,23,22,29,24,27,34,21,20,43,22,63,64,65,62,67,68,61,66,59,56 %N A091563 Row sums of A090172. %K A091563 nonn %O A091563 0,3 %A A091563 _Christian G. Bower_, Jan 20 2004