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 A154444 #6 Mar 31 2012 13:21:17 %S A154444 0,1,2,3,5,4,6,7,10,11,8,9,12,13,14,15,20,21,22,23,17,16,18,19,24,25, %T A154444 26,27,28,29,30,31,40,41,42,43,44,45,46,47,34,35,32,33,36,37,38,39,48, %U A154444 49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,80,81,82,83,84,85,86,87 %N A154444 Permutation of nonnegative integers: The inverse of A154443. %H A154444 A. Karttunen, <a href="/A154444/b154444.txt">Table of n, a(n) for n = 0..2047</a> %H A154444 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A154444 Inverse: A154443. a(n) = A153142(A154442(n)) = A054429(A154440(A054429(n))). Cf. A072376, A153141-A153142, A154435-A154436, A154439-A154448. Corresponds to A154454 in the group of Catalan bijections. %K A154444 nonn,base %O A154444 0,3 %A A154444 _Antti Karttunen_, Jan 17 2009 %E A154444 Spelling/notation corrections by _Charles R Greathouse IV_, Mar 18 2010