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 A037469 #13 Feb 16 2022 11:13:02
%S A037469 1,2,3,4,10,11,12,13,14,20,21,22,23,24,30,31,32,33,34,40,41,42,43,44,
%T A037469 100,101,102,103,104,110,111,112,113,114,120,121,122,123,124,130,131,
%U A037469 132,133,134,140,141,142,143,144,200,201,202,203
%N A037469 Duplicate of A007091.
%F A037469 A007091 \ {0}. [From _R. J. Mathar_, Oct 20 2008]
%K A037469 dead
%O A037469 1,2
%A A037469 _Clark Kimberling_