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 A187892 #25 Apr 11 2024 03:59:28
%S A187892 0,6,5,10,14,23,36,58,93,150,242,391,632,1022,1653,2674,4326,6999,
%T A187892 11324,18322,29645,47966,77610,125575,203184,328758,531941,860698,
%U A187892 1392638,2253335,3645972,5899306,9545277,15444582,24989858,40434439,65424296,105858734
%N A187892 a(0)=0, a(1)=6, a(n)=a(n-1)+a(n-2)-1.
%H A187892 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (2,0,-1).
%F A187892 G.f.: -x^2*(-6+7*x) / ( (x-1)*(x^2+x-1) ). - _R. J. Mathar_, Mar 15 2011
%F A187892 a(n) = 1+A022130(n-3), n>2. - _R. J. Mathar_, Mar 15 2011
%t A187892 Join[{a=0,b=6},Table[c=a+b-1;a=b;b=c,{n,100}]]
%t A187892 LinearRecurrence[{2,0,-1},{0,6,5},40] (* _Harvey P. Dale_, Aug 17 2019 *)
%Y A187892 Cf. A000071, A001611, A001612, A187890.
%K A187892 nonn,easy
%O A187892 0,2
%A A187892 _Vladimir Joseph Stephan Orlovsky_, Mar 15 2011