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 A098553 #9 Nov 22 2014 06:17:53 %S A098553 1,2,3,4,5,16,7,10,9,14,20,12,51,6,15,8,39,62,88,31,30,18,28,24,22,11, %T A098553 43,19,132,21,60,61,33,13,23,79,167,87,17,52,59,46,91,56,25,58,215,54, %U A098553 48,50,27,69,123,49,35,63,101,42,274,153,145,71,44,36,37,158,151,142,40 %N A098553 A098551(A098551(n)). %C A098553 Integer permutation with inverse A098552; %C A098553 A098550(a(n)) = a(A098550(n)) = A098551(n). %H A098553 Reinhard Zumkeller, <a href="/A098553/b098553.txt">Table of n, a(n) for n = 1..10000</a> %H A098553 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %o A098553 (Haskell) %o A098553 a098553 = a098551 . a098551 -- _Reinhard Zumkeller_, Nov 21 2014 %Y A098553 Cf. A098551, A098552. %K A098553 nonn %O A098553 1,2 %A A098553 _Reinhard Zumkeller_, Sep 14 2004