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 A194072 #8 Mar 19 2022 00:25:45 %S A194072 1,3,2,5,6,10,4,8,9,14,7,12,13,19,15,21,11,17,18,25,20,27,28,36,16,23, %T A194072 24,32,26,34,35,44,22,30,31,40,33,42,43,53,45,55,29,38,39,49,41,51,52, %U A194072 63,54,65,66,78,37,47,48,59,50,61,62,74,64,76,77,90,46,57,58 %N A194072 Inverse permutation to A194071; every positive integer occurs exactly once. %t A194072 (See A194071.) %Y A194072 Cf. A194071. %K A194072 nonn %O A194072 1,2 %A A194072 _Clark Kimberling_, Aug 14 2011