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 A194858 #8 Mar 18 2022 21:53:54 %S A194858 1,3,2,6,5,4,10,9,8,7,14,13,12,11,15,19,18,17,21,16,20,25,24,28,23,27, %T A194858 22,26,32,36,31,35,30,34,29,33,40,44,39,43,38,42,37,41,45,49,53,48,52, %U A194858 47,51,55,46,50,54,59,63,58,62,66,57,61,65,56,60,64,70,74,78 %N A194858 Inverse permutation to A194857; every positive integer occurs exactly once. %t A194858 (See A194857.) %Y A194858 Cf. A194857, A194856. %K A194858 nonn %O A194858 1,2 %A A194858 _Clark Kimberling_, Sep 04 2011