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 A194876 #5 Mar 30 2012 18:57:44 %S A194876 1,3,2,5,4,6,8,10,7,9,12,14,11,13,15,17,19,21,16,18,20,23,25,27,22,24, %T A194876 26,28,30,32,34,36,29,31,33,35,38,40,42,44,37,39,41,43,45,47,49,51,53, %U A194876 55,46,48,50,52,54,66,57,59,61,63,65,56,58,60,62,64,77,68,70 %N A194876 Inverse permutation of A184875; every positive integer occurs exactly once. %t A194876 (See A194874.) %Y A194876 Cf. A194874, A194875. %K A194876 nonn %O A194876 1,2 %A A194876 _Clark Kimberling_, Sep 04 2011