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 A085181 #9 Jan 12 2024 07:48:26 %S A085181 1,2,3,5,4,6,9,10,14,8,15,20,13,7,21,27,28,35,19,36,44,45,54,26,55,65, %T A085181 34,12,66 %N A085181 Inverse permutation to A085180. %H A085181 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %K A085181 nonn,more %O A085181 1,2 %A A085181 _Antti Karttunen_, Jun 18 2003