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 A095939 #12 Jul 31 2015 12:57:13
%S A095939 1,2,9,39,168,723,3111,13386,57597,247827,1066344,4588239,19742163,
%T A095939 84946098,365504001,1572681711,6766896552,29116437627,125281498479,
%U A095939 539058179514,2319446402133,9980057472123,42941948154216
%N A095939 a(n+2) = 5a(n+1) - 3a(n) (n >= 1); a(0) = 1, a(1) = 2, a(2) = 9.
%H A095939 Harvey P. Dale, <a href="/A095939/b095939.txt">Table of n, a(n) for n = 0..1000</a>
%H A095939 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (5, -3).
%t A095939 Join[{1},LinearRecurrence[{5,-3},{2,9},30]] (* _Harvey P. Dale_, Sep 04 2013 *)
%Y A095939 Equals A095934 - A095940. Cf. A052961.
%K A095939 nonn,easy
%O A095939 0,2
%A A095939 _N. J. A. Sloane_, Jul 13 2004
%E A095939 Extended by _Ray Chandler_, Jul 16 2004