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 A097657 #14 Feb 20 2017 10:33:12
%S A097657 11,23,34,57,91,148,239,387,626,1013,1639,2652,4291,6943,11234,18177,
%T A097657 29411,47588,76999,124587,201586,326173,527759,853932,1381691,2235623,
%U A097657 3617314,5852937,9470251,15323188,24793439
%N A097657 Fibonacci sequence with first two terms 11 and 23.
%H A097657 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a>
%H A097657 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (1, 1).
%F A097657 a(n) = a(n-1) + a(n-2) for n > 1, a(0) = 11, a(1) = 23.
%F A097657 G.f.: (11 + 12*x)/(1 - x - x^2). - _Philippe Deléham_, Nov 20 2008
%F A097657 a(n) = h*Fibonacci(n+k) + Fibonacci(n+k-h) with h=7, k=3. - _Bruno Berselli_, Feb 20 2017
%t A097657 a[0] := 11; a[1] := 23; a[n_] := a[n - 1] + a[n - 2]; Table[a[n], {n, 0, 25}] (* _Stefan Steinerberger_, Mar 06 2006 *)
%o A097657 (PARI) a(n)=([0,1; 1,1]^n*[11;23])[1,1] \\ _Charles R Greathouse IV_, Feb 20 2017
%Y A097657 Cf. A000045.
%K A097657 nonn,easy
%O A097657 0,1
%A A097657 _Parthasarathy Nambi_, Sep 20 2004
%E A097657 More terms from _Stefan Steinerberger_, Mar 06 2006