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 A308883 #5 Jun 30 2019 17:48:17 %S A308883 1,4,7,2,6,5,3,11,14,17,8,20,19,9,24,27,10,30,13,12,31,35,38,15,41,40, %T A308883 16,45,48,18,21,50,53,56,22,59,58,23,63,26,25,67,70,73,28,72,75,29,79, %U A308883 32,82,85,33,88,87,34,92,37,36,96,99,102,39,101,104,107,42 %N A308883 a(n) = position of 1 in n-th column of array in A274630. %C A308883 Also, a(n) = 1 + position of 0 in column n-1 of A308201. %C A308883 Equals A307281 + 1. This is a self-inverse permutation of the positive integers. %Y A308883 Cf. A274630, A308201, A307281. %K A308883 nonn %O A308883 1,2 %A A308883 _N. J. A. Sloane_, Jun 30 2019