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 A194907 #5 Mar 30 2012 18:57:44 %S A194907 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26, %T A194907 27,28,36,29,30,31,32,33,34,35,44,37,45,38,39,40,41,42,43,53,46,54,47, %U A194907 55,48,49,50,51,52,63,56,64,57,65,58,66,59,60,61,62,74,67,75 %N A194907 Inverse permutation of A194906; every positive integer occurs exactly once. %t A194907 (See A194905.) %Y A194907 Cf. A194905, A194906. %K A194907 nonn %O A194907 1,2 %A A194907 _Clark Kimberling_, Sep 05 2011