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 A033986 #5 Sep 20 2023 02:56:36 %S A033986 10,6,13,1,13,10,10,1,19,15,14,4 %N A033986 Order of first letter of n-th month of the year. %K A033986 fini,full,less,nonn,word %O A033986 1,1 %A A033986 _Jeff Burch_