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%I #10 May 04 2018 22:41:01
%S 2,2,2,4,6,9,15,20,28,42,60,90,135,195,286,418,608,896,1316,1927,2829,
%T 4140,6060,8888,13024,19092,27993,41013,60102,88086,129082,189196,
%U 277298,406385,595595,872872,1279224,1874826,2747700,4026950,5901823,8649495
%N Ratio A191650(n+1)/A191650(n).
%H R. H. Hardin, <a href="/A191651/b191651.txt">Table of n, a(n) for n = 1..50</a>
%F Empirical: a(n)=a(n-1)+a(n-3)-a(n-4)+a(n-5)+a(n-6)-a(n-9) - _R. H. Hardin_, Jun 13 2011
%F Empirical g.f.: x*(2 + 2*x^4 + x^5 - x^7 - x^8) / ((1 - x - x^3)*(1 + x^4 - x^6)). - _Colin Barker_, May 04 2018
%K nonn
%O 1,1
%A _R. H. Hardin_, Jun 10 2011