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 A008554 #9 Jul 08 2025 01:05:06 %S A008554 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,100,101,102,103, %T A008554 104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,200, %U A008554 201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,216,217,218 %N A008554 Numbers that do not contain the letter `y'. %Y A008554 Cf. A055644. %K A008554 nonn,word %O A008554 1,3 %A A008554 _N. J. A. Sloane_