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 A050091 #10 Jul 04 2021 13:49:32 %S A050091 2,4,6,8,9,11,12,15,17,19,21,22,23,25,26,27,29,31,32,36,38,40,42,43, %T A050091 44,46,47,48,50,51,53,54,56,57,59,61,62,64,66,67,69,70,72,74,75,76,78, %U A050091 80,81,83,85,86,87,89,91,93,94,96,98,100,101 %N A050091 Numbers k such that A050088(k) > A050088(k+1). %K A050091 nonn %O A050091 1,1 %A A050091 _Clark Kimberling_