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 A194060 #8 Mar 19 2022 00:25:09 %S A194060 1,3,2,5,6,4,8,9,10,15,7,12,13,14,20,21,28,36,11,17,18,19,26,27,35,44, %T A194060 45,55,66,78,16,23,24,25,33,34,43,53,54,65,77,22,30,31,32,41,42,52,63, %U A194060 64,76,29,38,39,40,50,51,62,74,75 %N A194060 Inverse permutation to A194059; every positive integer occurs exactly once. %t A194060 (See A194059.) %Y A194060 Cf. A194059. %K A194060 nonn %O A194060 1,2 %A A194060 _Clark Kimberling_, Aug 14 2011