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 A194035 #5 Mar 30 2012 18:57:39 %S A194035 1,3,6,10,2,5,9,14,15,21,4,8,13,19,20,27,28,36,7,12,18,25,26,34,35,44, %T A194035 45,55,11,17,24,32,33,42,43,53,54,65,66,78,16,23,31,40,41,51,52,63,64, %U A194035 76,77,90,91,22,30,39,49,50 %N A194035 Inverse permutation of A194034; contains every positive integer exactly once. %t A194035 (See A194034.) %Y A194035 Cf. A194034. %K A194035 nonn %O A194035 1,2 %A A194035 _Clark Kimberling_, Aug 12 2011