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 A313986 #10 May 05 2023 14:28:01 %S A313986 1,5,10,17,23,28,33,40,45,48,55,63,68,71,78,85,88,93,101,108,111,116, %T A313986 123,128,133,139,146,151,156,161,166,173,179,184,189,196,201,204,211, %U A313986 219,224,227,234,241,244,249,257,264,267,272 %N A313986 Duplicate of A299910. %K A313986 dead %O A313986 0,2