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 A264991 #6 Dec 06 2015 21:14:13 %S A264991 0,1,5,2,4,14,6,16,17,3,7,8,11,13,41,15,43,44,18,19,59,56,49,50,47,52, %T A264991 53,9,10,32,29,22,23,20,25,26,12,34,35,38,40,122,42,124,125,45,46,140, %U A264991 137,130,131,128,133,134,54,55,167,164,58,176,60,178,179,57,169,170,173,148,149,51,151,152,48 %N A264991 Permutation of nonnegative integers: a(n) = A264989(A264985(n)). %H A264991 Antti Karttunen, <a href="/A264991/b264991.txt">Table of n, a(n) for n = 0..9841</a> %H A264991 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %F A264991 a(n) = A264989(A264985(n)). %o A264991 (Scheme) (define (A264991 n) (A264989 (A264985 n))) %Y A264991 Inverse: A264992. %Y A264991 Cf. A263273, A264985, A264989. %Y A264991 Cf. also A264975, A264976. %K A264991 nonn %O A264991 0,3 %A A264991 _Antti Karttunen_, Dec 05 2015