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 A253883 #8 Jan 17 2015 23:42:08 %S A253883 1,2,8,4,6,16,1024,3,64,256,20,128,1073741824,16384,18,32,240,512, %T A253883 3538944,48,524288,288,8640,5,32768,4398046511104,27,2097152, %U A253883 214990848,65536,660,12,162,37778931862957161709568,134217728,4096 %N A253883 Permutation of natural numbers: a(n) = A243505(A122111(n)). %C A253883 Term a(37) has 310 decimal digits and its binary representation is 1028 bits long. %H A253883 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %F A253883 a(n) = A243505(A122111(n)). %o A253883 (Scheme) (define (A253883 n) (A243505 (A122111 n))) %Y A253883 Inverse: A253884. %Y A253883 Similar permutations: A253791, A253891, A122111, A243505. %Y A253883 Cf. also A253890. %K A253883 nonn %O A253883 1,2 %A A253883 _Antti Karttunen_, Jan 17 2015