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 A146082 #27 Dec 12 2023 08:23:10
%S A146082 2,4,6,8,1,3,5,7,0,2,4,6,8,1,3,5,7,0,2,4,6,8,1,3,5,7,0,2,4,6,8,1,3,5,
%T A146082 7,0,2,4,6,8,1,3,5,7,0,2,4,6,8,1,3,5,7,0,2,4,6,8,1,3,5,7,0,2,4,6,8,1,
%U A146082 3,5,7,0,2,4,6,8,1,3,5,7,0
%N A146082 a(n) = A146081(n) mod 9.
%C A146082 A periodic double sawtooth pattern of positive even and odd numbers.
%H A146082 G. C. Greubel, <a href="/A146082/b146082.txt">Table of n, a(n) for n = 0..10000</a>
%H A146082 <a href="/index/Rec#order_09">Index entries for linear recurrences with constant coefficients</a>, signature (0, 0, 0, 0, 0, 0, 0, 0, 1).
%F A146082 a(n) = A131669(n+2)-1.
%F A146082 Period 9: a(n+9)=a(n).
%F A146082 a(n) = (74*n + 110) mod 9. - _G. C. Greubel_, Jan 29 2016
%t A146082 a := LinearRecurrence[{2, -1}, {110, 184}, 100];
%t A146082 Mod[a, 9] (* _G. C. Greubel_, Jan 29 2016 *)
%t A146082 PadRight[{},120,{2,4,6,8,1,3,5,7,0}] (* _Harvey P. Dale_, Sep 18 2016 *)
%o A146082 (Magma) &cat[[2,4,6,8,1,3,5,7,0]^^10]; // _Vincenzo Librandi_, Jan 30 2016
%K A146082 nonn
%O A146082 0,1
%A A146082 _Paul Curtz_, Oct 27 2008
%E A146082 Edited by _R. J. Mathar_, Dec 08 2008