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 A154440 #6 Mar 31 2012 13:21:17 %S A154440 0,1,2,3,4,5,7,6,8,9,10,11,14,15,12,13,16,17,18,19,20,21,22,23,28,29, %T A154440 31,30,24,25,26,27,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,56, %U A154440 57,58,59,62,63,60,61,48,49,50,51,52,53,54,55,64,65,66,67,68,69,70,71 %N A154440 Permutation of nonnegative integers: the inverse of A154439. %H A154440 A. Karttunen, <a href="/A154440/b154440.txt">Table of n, a(n) for n = 0..2047</a> %H A154440 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A154440 Inverse: A154439. a(n) = A153141(A154446(n)) = A054429(A154444(A054429(n))). Cf. A072376, A153141-A153142, A154435-A154436, A154442-A154448. Corresponds to A154450 in the group of Catalan bijections. %K A154440 nonn,base %O A154440 0,3 %A A154440 _Antti Karttunen_, Jan 17 2009 %E A154440 Spelling/notation corrections by _Charles R Greathouse IV_, Mar 18 2010