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 A190913 #22 Aug 23 2018 02:13:57
%S A190913 5,0,2,9,2,10,29,14,50,99,82,220,365,416,926,1429,1954,3842,5825,8778,
%T A190913 15922,24299,38414,66240,102533,165560,276954,434745,707394,1163074,
%U A190913 1846069,3008302,4900546,7839115,12762378,20694684,33271421,54081272,87516358,141133157,229065490,370410810,598383689,970090922,1568482962
%N A190913 Sequence A190914 evaluated at the negative index -n.
%H A190913 Vincenzo Librandi, <a href="/A190913/b190913.txt">Table of n, a(n) for n = 0..1000</a>
%H A190913 <a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (0,1,3,0,-1)
%F A190913 From _R. J. Mathar_, Jun 05 2011: (Start)
%F A190913 a(n) = A190914(-n).
%F A190913 G.f.: ( 5-3*x^2-6*x^3 ) / ( (x^2+x-1)*(x^3-x^2-x-1) ). (End)
%F A190913 a(n) = A000032(n) + A073145(n). - _R. J. Mathar_, Jun 05 2011
%t A190913 LinearRecurrence[{0,1,3,0,-1},{5,0,2,9,2},50] (* _Vincenzo Librandi_, Feb 15 2012 *)
%o A190913 (PARI) Vec((5-3*x^2-6*x^3)/((x^2+x-1)*(x^3-x^2-x-1))+O(x^99)) \\ _Charles R Greathouse IV_, Jun 08 2011
%Y A190913 Cf. A190914, A000045, A000073, A001608, A000040, A005117, A125666.
%K A190913 nonn,easy
%O A190913 0,1
%A A190913 _Reikku Kulon_, May 23 2011