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 A144481 #9 Dec 12 2023 08:21:45 %S A144481 5,3,0,5,0,3,5,6,6,5,3,0,5,0,3,5,6,6,5,3,0,5,0,3,5,6,6,5,3,0,5,0,3,5, %T A144481 6,6 %N A144481 a(n) = A078371(n-1) mod 9. %F A144481 Period 9: a(n+9)=a(n). %K A144481 nonn %O A144481 1,1 %A A144481 _Paul Curtz_, Oct 12 2008 %E A144481 Edited by _R. J. Mathar_, Dec 08 2008