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 A095940 #20 Aug 29 2025 06:54:08
%S A095940 0,1,4,17,73,314,1351,5813,25012,107621,463069,1992482,8573203,
%T A095940 36888569,158723236,682950473,2938582657,12644061866,54404561359,
%U A095940 234090621197,1007239421908,4333925245949,18647907964021,80237764082258
%N A095940 a(n+2) = 5*a(n+1) - 3*a(n) (n >= 1); a(0) = 0, a(1) = 1, a(2) = 4.
%H A095940 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (5,-3).
%F A095940 G.f.: (x-x^2)/(3*x^2-5*x+1). - _Harvey P. Dale_, Aug 20 2011
%t A095940 Join[{0},LinearRecurrence[{5,-3},{1,4},30]] (* _Harvey P. Dale_, Aug 20 2011 *)
%Y A095940 Cf. A018902; equals A095934 - A095939.
%K A095940 nonn,easy,changed
%O A095940 0,3
%A A095940 _N. J. A. Sloane_, Jul 13 2004
%E A095940 Extended by _Ray Chandler_, Jul 16 2004