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 A141449 #4 Jun 18 2023 05:24:46 %S A141449 1,1,2,8,2,5,8,2,5,8,2,5,8,2,5,8,2,5,8,2,5,8,2,5,8,2,5,8,2,5,8,2,5,8, %T A141449 2,5,8,2,5,8,2,5,8,2,5,8,2,5,8,2,5,8,2,5,8,2,5,8,2,5,8,2,5,8,2,5,8,2, %U A141449 5,8,2,5,8,2,5,8,2,5,8,2,5,8,2,5,8 %N A141449 A005439 mod 9. %K A141449 nonn %O A141449 0,3 %A A141449 _Paul Curtz_, Aug 07 2008 %E A141449 Missing a(0)=1 inserted by _Sean A. Irvine_, Jun 18 2023