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 A194978 #7 May 03 2012 16:01:18 %S A194978 1,2,3,4,5,6,7,8,10,9,11,12,14,15,13,16,17,19,20,21,18,22,23,25,26,28, %T A194978 27,24,29,30,32,33,35,36,34,31,37,38,40,41,43,44,45,42,39,46,47,49,50, %U A194978 52,53,54,55,51,48,56,57,59,60,62,63,64,66,65,61,58,67,68,70 %N A194978 Inverse permutation of A194977; every positive integer occurs exactly once. %t A194978 (See A194977.) %Y A194978 Cf. A194977, A194976, A194959. %K A194978 nonn %O A194978 1,2 %A A194978 _Clark Kimberling_, Sep 07 2011