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 A383446 #13 Apr 30 2025 13:41:38 %S A383446 0,2,4,8,6,11,7,12,18,13,19,25,20,26,32,27,33,38,34,39,44,40,45,51,46, %T A383446 52,50,53,59,57,60,58,65,69,64,70,74,72,78,73,77,83,86,84,87,85,95,97, %U A383446 94,96,101,104,102,107,103,108,114,109,115,118,116,119,117,120,129,132,130,136,131,135,140,143,141,144,142,145,156 %N A383446 Index of -n in A377090, or -1 if -n does not appear there. %C A383446 It is conjectured (see A377090) that every positive integer appears exactly once either here or in A383445. %H A383446 N. J. A. Sloane, <a href="/A383446/b383446.txt">Table of n, a(n) for n = 0..5003</a> %Y A383446 Cf. A377090, A383445. %K A383446 nonn %O A383446 0,2 %A A383446 _N. J. A. Sloane_, Apr 30 2025