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 A168037 #13 Dec 12 2023 07:46:32
%S A168037 0,1,2,0,8,7,0,4,5,0,5,4,0,7,8,0,2,1,0,1,2,0,8,7,0,4,5,0,5,4,0,7,8,0,
%T A168037 2,1,0,1,2,0,8,7,0,4,5,0,5,4,0,7,8,0,2,1
%N A168037 Period length 18: repeat 0,1,2,0,8,7,0,4,5,0,5,4,0,7,8,0,2,1.
%C A168037 Represents also the decimal expansion of 447668335336223/37037037037037037.
%H A168037 <a href="/index/Rec#order_18">Index entries for linear recurrences with constant coefficients</a>, signature (0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1).
%F A168037 a(n) = A129194(n) mod 9.
%F A168037 a(n) = a(n-18).
%F A168037 a(n+1) = a(17-n), 0<=n<= 16, palindromic.
%F A168037 G.f. ( -x*(1+2*x+8*x^3+7*x^4+4*x^6+5*x^7+5*x^9+4*x^10+7*x^12+8*x^13+2*x^15+x^16) ) / ( (x-1)*(1+x+x^2)*(1+x^3+x^6)*(1+x)*(1-x+x^2)*(1-x^3+x^6) ). - R. J. Mathar, Jan 22 2011
%t A168037 PadRight[{},60,{0,1,2,0,8,7,0,4,5,0,5,4,0,7,8,0,2,1}] (* _Harvey P. Dale_, Jan 17 2021 *)
%Y A168037 Cf. A154811.
%K A168037 nonn,easy
%O A168037 0,3
%A A168037 _Paul Curtz_, Nov 17 2009