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 A245443 #8 Jul 22 2014 16:00:23 %S A245443 0,1,2,3,7,6,4,5,10,11,9,8,15,14,12,13,27,26,24,25,30,31,29,28,20,21, %T A245443 23,22,17,16,18,19,38,39,37,36,35,34,32,33,41,40,42,43,44,45,47,46,55, %U A245443 54,52,53,50,51,49,48,56,57,59,58,61,60,62,63,127,126,124,125,122,123,121,120,112 %N A245443 Permutation of nonnegative integers: a(n) = A165199(A193231(n)). %H A245443 Antti Karttunen, <a href="/A245443/b245443.txt">Table of n, a(n) for n = 0..1023</a> %H A245443 <a href="/index/Bi#binary">Index entries for sequences related to binary expansion of n</a> %H A245443 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %F A245443 a(n) = A165199(A193231(n)). %o A245443 (Scheme) (define (A245443 n) (A165199 (A193231 n))) %Y A245443 Inverse: A245444. %Y A245443 Cf. A165199, A193231, A245445, A245446. %K A245443 nonn %O A245443 0,3 %A A245443 _Antti Karttunen_, Jul 22 2014