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 A194898 #5 Mar 30 2012 18:57:44 %S A194898 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,21,16,17,18,19,20,27,22,28,23,24, %T A194898 25,26,34,29,35,30,36,31,32,33,42,37,43,38,44,39,45,40,41,51,46,52,47, %U A194898 53,48,54,49,55,50,61,56,62,57,63,58,64,59,65,60,66,72,78,67 %N A194898 Inverse permutation of A194897; every positive integer occurs exactly once. %t A194898 (See A194896.) %Y A194898 Cf. A194896, A194897. %K A194898 nonn %O A194898 1,2 %A A194898 _Clark Kimberling_, Sep 04 2011