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 A194879 #5 Mar 30 2012 18:57:44 %S A194879 1,3,2,6,5,4,10,9,8,7,15,14,13,12,11,20,19,18,17,16,21,26,25,24,23,28, %T A194879 22,27,33,32,31,36,30,35,29,34,41,40,45,39,44,38,43,37,42,50,55,49,54, %U A194879 48,53,47,52,46,51,66,60,65,59,64,58,63,57,62,56,61,77,71,76 %N A194879 Inverse permutation of A194878; every positive integer occurs exactly once. %t A194879 (See A194877.) %Y A194879 Cf. A194877, A194878. %K A194879 nonn %O A194879 1,2 %A A194879 _Clark Kimberling_, Sep 04 2011