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 A050131 #10 Jul 04 2021 14:01:56 %S A050131 1,3,4,6,9,10,12,15,17,20,22,24,27,29,32,34,37,40,42,44,46,48,51,53, %T A050131 56,58,61,64,66,68,71,73,76,78,81,82,84,86,88,91,93,94,96,99,101,104, %U A050131 106,109,112,114,116,119,121,124,126,129,130 %N A050131 Numbers k such that A050128(k) < A050128(k+1). %K A050131 nonn %O A050131 1,2 %A A050131 _Clark Kimberling_