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 A303850 #13 Jul 15 2023 06:08:00 %S A303850 1,10,2,11,3,12,4,13,5,14,6,15,7,16,8,17,9,18,100,19,101,20,102,21, %T A303850 103,22,104,23,105,24,106,25,107,26,108,27,109,28,110,29,111,30,112, %U A303850 31,113,32,114,33,115,34,116,35,117,36,118,37,119,38,120,39,121,40,122,41,123,42,124,43,125,44,126,45,127 %N A303850 Duplicate of A303848. %K A303850 dead %O A303850 1,2