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 A194031 #10 Jun 14 2021 07:10:29 %S A194031 1,2,4,3,7,5,6,11,8,9,10,15,16,12,13,14,20,21,28,36,22,17,18,19,26,27, %T A194031 35,44,45,55,66,78,91,29,23,24,25,33,34,43,53,54,65,77,90,37,30,31,32, %U A194031 41,42,52,63,64,76 %N A194031 Inverse permutation of A194030; contains every positive integer exactly once. %C A194031 See A194029. %H A194031 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %t A194031 (See A194029.) %Y A194031 Cf. A194029, A194030 (inverse). %K A194031 nonn %O A194031 1,2 %A A194031 _Clark Kimberling_, Aug 12 2011