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 A206522 #5 Mar 30 2012 16:52:09 %S A206522 2,5,7,10,12,13,15,17,20,22,23,24,25,27,28,29,32,34,35,37,39,40,41,42, %T A206522 45,47,49,52,55,58,59,60,62,64,66,69,71,72,76,79,80,82,83,87,89,92,94, %U A206522 99,100,103,104,105,106,111,112,114,117,118,119,121,124,126,128,129,131,135,138,139,143,144,145,146,147,149,153,156,158,159,160,167,170,171,172,174,175 %N A206522 The pairwise differences of the terms of A004210. %Y A206522 Cf. A004210, A206523, A206524. %K A206522 nonn %O A206522 1,1 %A A206522 _N. J. A. Sloane_, Feb 08 2012