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 A183188 #24 Nov 02 2024 16:36:13
%S A183188 1,2,6,19,59,183,568,1763,5472,16984,52715,163617,507835,1576220,
%T A183188 4892277,15184666,47130218,146282931,454033459,1409230595,4373974716,
%U A183188 13575957607,42137103416,130785284964,405931812499,1259932540913,3910582907703,12137680535608
%N A183188 a(n) = 3*a(n-1) + a(n-3) with a(0)=1, a(1)=2, a(2)=6.
%H A183188 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (3,0,1).
%F A183188 G.f.: (1-x)/(1-3*x-x^3).
%F A183188 a(n) = A052541(n) - A051541(n-1). - _R. J. Mathar_, Dec 15 2011
%t A183188 LinearRecurrence[{3,0,1},{1,2,6},30] (* _Harvey P. Dale_, Nov 02 2024 *)
%Y A183188 Cf. A052541, A193723.
%K A183188 easy,nonn
%O A183188 0,2
%A A183188 _Philippe Deléham_, Dec 14 2011
%E A183188 Corrected by _R. J. Mathar_, Dec 15 2011