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 A245452 #6 Jul 22 2014 16:01:57 %S A245452 1,2,4,3,9,8,18,5,6,25,75,16,150,36,27,7,735,12,1470,49,50,245,12705, %T A245452 32,15,300,10,72,25410,125,195195,11,225,4235,54,24,390390,2940,490, %U A245452 121,4339335,100,8678670,847,81,65065,92147055,64,30,35,2205,600,184294110,20,147,144,8470,50820,2565568005,343,5131136010,1446445,98,13 %N A245452 Self-inverse permutation of nonnegative integers, A075158-conjugate of the inverse of gray code: a(n) = 1 + A075157(A006068(A075158(n-1))). %H A245452 Antti Karttunen, <a href="/A245452/b245452.txt">Table of n, a(n) for n = 1..1024</a> %H A245452 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %F A245452 a(n) = 1 + A075157(A006068(A075158(n-1))). %o A245452 (Scheme) (define (A245452 n) (+ 1 (A075157 (A006068 (A075158 (- n 1)))))) %Y A245452 Inverse: A245451. %Y A245452 Cf. A006068, A075157, A075158. %Y A245452 Similar permutations: A245454, A122111, A241909, A241916. %K A245452 nonn %O A245452 1,2 %A A245452 _Antti Karttunen_, Jul 22 2014