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 A074050 #5 Jan 06 2025 22:25:04 %S A074050 1,2,3,5,4,9,6,7,17,10,11,13,8,33,18,19,21,12,25,14,15,65,34,35,37,20, %T A074050 41,22,23,49,26,27,29,16,129,66,67,69,36,73,38,39,81,42,43,45,24,97, %U A074050 50,51,53,28,57,30,31,257,130,131,133,68,137,70,71,145,74,75,77,40,161,82,83,85,44,89,46,47,193,98 %N A074050 Inverse permutation to A074049. %Y A074050 Cf. A074049. %K A074050 nonn %O A074050 1,2 %A A074050 _Clark Kimberling_, Aug 14 2002 %E A074050 Missing terms inserted by _Sean A. Irvine_, Jan 06 2025