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 A073295 #8 May 26 2017 14:56:10 %S A073295 0,1,2,3,4,5,6,7,8,10,9,11,13,12,14,15,16,18,17,19,20,22,21,27,26,25, %T A073295 23,24,29,28,33,36,35,30,34,31,32,38,37,39,41,40,42,43,47,50,49,44,48, %U A073295 45,46,51,52,53,55,54,60,61,64,63,56,57,62,58,59,78,77,76,73,74,75,72 %N A073295 Permutation A069768 applied four times or permutation A073291 applied twice. %H A073295 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %F A073295 a(n) = A069768(A069768(A069768(A069768(n)))) = A073291(A073291(n)). %Y A073295 Inverse permutation: A073294. Cf. A073290-A073299. %K A073295 nonn %O A073295 0,3 %A A073295 _Antti Karttunen_, Jun 25 2002