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 A014842 #4 Mar 30 2012 17:20:36 %S A014842 2,0,5,2,9,3,7,6,15,2,21,14,19,9,25,7,31,12,27,28,42,10,38,34,35,22, %T A014842 55,16,59,27,49,48,54,10,71,52,61,30,82,34,88,56,66,75,103,27,88,59, %U A014842 84,64,112,46,97,56,105,96,130,28,138,114,108,70,118,66,146,94,121,86 %N A014842 Difference between A014837 and A014841. %K A014842 nonn %O A014842 3,1 %A A014842 _Olivier Gérard_