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 A253892 #6 Jan 17 2015 23:42:47 %S A253892 0,1,7,3,30,63,4,2,8191,57,510,11,511,10,31,6,524286, %T A253892 36893488147419103231,131068,65532,1073741823,16381,8190,262143,508, %U A253892 248,65535,125,16,60,127,15,4194299,633825300114114700748351602685,2097134,200867255532373784442745261542645325315275374222849104412671,10141204801825835211973625643007,442,268435451,32754,190 %N A253892 Permutation of natural numbers: a(n) = A243071(A245612(n)). %H A253892 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %F A253892 a(n) = A243071(A245612(n)). %F A253892 As a composition of other related permutations: %F A253892 a(n) = A054429(A253792(A054429(n))). %o A253892 (Scheme) (define (A253892 n) (A243071 (A245612 n))) %Y A253892 Inverse: A253891. %Y A253892 Cf. A243071, A245612, A054429, A253792, A253884. %K A253892 nonn %O A253892 0,3 %A A253892 _Antti Karttunen_, Jan 17 2015