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 A131083 #25 Apr 18 2024 09:47:28
%S A131083 26,16,6,2,6,16,26,30,26,16,6,2,6,16,26,30,26,16,6,2,6,16,26,30,26,16,
%T A131083 6,2,6,16,26,30,26,16,6,2,6,16,26,30,26,16,6,2,6,16,26,30,26,16,6,2,6,
%U A131083 16,26,30,26,16,6,2,6,16,26,30,26,16,6,2,6,16,26,30,26,16,6,2,6,16,26,30
%N A131083 Periodic sequence (26, 16, 6, 2, 6, 16, 26, 30).
%C A131083 Sixth column of triangular array T defined in A131074.
%H A131083 <a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (1,0,0,-1,1).
%F A131083 a(n) = a(n-8).
%F A131083 G.f.: x*(26-10*x-10*x^2-4*x^3+30*x^4)/((1-x)*(1+x^4)).
%t A131083 PadRight[{},90,{26,16,6,2,6,16,26,30}] (* _Harvey P. Dale_, Nov 02 2017 *)
%o A131083 (PARI) {m=80; for(n=1, m, r=(n-1)%8; print1(if(r==0||r==6, 26, if(r==1||r==5, 16, if(r==2||r==4, 6, if(r==3, 2, 30)))), ","))}
%o A131083 (Magma) m:=80; [ [26, 16, 6, 2, 6, 16, 26, 30][(n-1) mod 8 + 1]: n in [1..m] ];
%Y A131083 Cf. A131074, A131030.
%K A131083 nonn,easy,less
%O A131083 1,1
%A A131083 _Klaus Brockhaus_, following a suggestion of _Paul Curtz_, Jun 14 2007