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 A156331 #11 Dec 12 2023 08:03:52
%S A156331 8,16,40,32,56,64,64,56,32,40,16,8,8,16,40,32,56,64,64,56,32,40,16,8,
%T A156331 8,16,40,32,56,64,64,56,32,40,16,8,8,16,40,32,56,64,64,56,32,40,16,8,
%U A156331 8,16,40,32,56,64,64,56,32,40,16,8,8,16,40,32,56,64,64,56,32,40,16,8,8,16,40
%N A156331 a(n)=8*A154811(n).
%H A156331 <a href="/index/Rec#order_07">Index entries for linear recurrences with constant coefficients</a>, signature (1, 0, 0, 0, 0, -1, 1).
%F A156331 Period length 12: a(n)=a(n-12).
%F A156331 a(n) = A154811(n+6) = A155110(n) (mod 9).
%t A156331 8*Mod[Fibonacci[Range[1,151,2]],9] (* or *) PadRight[{},80,{8,16,40,32,56,64,64,56,32,40,16,8}] (* _Harvey P. Dale_, Jul 10 2018 *)
%K A156331 nonn,easy
%O A156331 0,1
%A A156331 _Paul Curtz_, Feb 08 2009
%E A156331 Edited and extended by _R. J. Mathar_, Apr 10 2009