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 A244914 #18 Jan 02 2019 22:08:37 %S A244914 2,3,5,11,17,167,193,197,433,4111,9173,42929,95279,98897,139409 %N A244914 Duplicate of A227126. %K A244914 dead %O A244914 1,1