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 A144478 #18 Dec 12 2023 08:21:10 %S A144478 1,0,5,7,6,2,4,3,8,1,0,5,7,6,2,4,3,8,1,0,5,7,6,2,4,3,8,1,0,5,7,6,2,4, %T A144478 3,8,1,0,5,7,6,2,4,3,8,1,0,5,7,6,2,4,3,8 %N A144478 Period 9: repeat 1,0,5,7,6,2,4,3,8. %C A144478 Essentially the same as A145577. %H A144478 <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (0,0,0,0,0,0,0,0,1). %F A144478 a(n) = A144390(n) mod 9. %F A144478 a(9n+2)+a(9n+3)+a(9n+4) = a(9n+5)+a(9n+6)+a(9n+7) = a(9n+8)+a(9n+9)+a(9n+10) = 12. %F A144478 a(n+4)-a(n+1) = period length 9 (repeat 6,-3,-3,-3,6,-3,-3,-3,6). %o A144478 (PARI) a(n)=[1,0,5,7,6,2,4,3,8][n%9+1] \\ _Charles R Greathouse IV_, Jun 02 2011 %K A144478 nonn,easy,less %O A144478 1,3 %A A144478 _Paul Curtz_, Oct 11 2008