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 A085142 #6 Feb 18 2023 08:27:53 %S A085142 1,0,-4,4,-4,4,-4,8,-4,0,-4,8,-4,0,-4,4,-4,0,0,8,-4,-4,-4,8,0,0,0,4, %T A085142 -4,0,-4,8,-4,-4,0 %N A085142 Duplicate of A064053. %K A085142 dead %O A085142 0,3