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 A246265 #7 Aug 22 2014 16:49:42 %S A246265 1,2,3,7,6,4,12,5,9,21,8,13,32,27,10,17,15,20,57,11,18,22,48,42,30,14, %T A246265 102,31,39,75,24,16,183,37,19,62,157,33,23,34,36,25,132,66,47,41,26, %U A246265 82,111,72,97,45,28,282,29,69,52,87,107,53,237,43,51,84,207,90,35,147,64,54,129,38,174,67,56,507,55,60,152,93,40 %N A246265 Permutation of natural numbers: a(n) = (1+A048673(A246261(n)))/2. %H A246265 Antti Karttunen, <a href="/A246265/b246265.txt">Table of n, a(n) for n = 1..10001</a> %H A246265 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %F A246265 a(n) = (1+A048673(A246261(n)))/2. %o A246265 (Scheme) (define (A246265 n) (/ (+ 1 (A048673 (A246261 n))) 2)) %Y A246265 Inverse: A246266. %Y A246265 Cf. also A048673, A246261, A246267. %K A246265 nonn %O A246265 1,2 %A A246265 _Antti Karttunen_, Aug 21 2014