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%I #8 Oct 02 2023 14:04:10
%S 1,0,2,1,3,5,4,15,8,34,27,65,91,120,257,256,618,665,1339,1845,2828,
%T 4879,6312,11930,15331,27465,38987,61936,98433,142400,240274,339825,
%U 567923,832549,1322772,2046095,3097096,4963410,7369067,11849041,17779323,28025960,43079809,66310080,103927418
%N Expansion of (1+x)/(1+x-2*x^2-3*x^3).
%H Ira M. Gessel, <a href="http://people.brandeis.edu/~gessel/homepage/slides/nonneg.pdf">Rational Functions With Nonnegative Integer Coefficients</a>, slides, 50th Séminaire Lotharingien de Combinatoire, 2003.
%H <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (-1, 2, 3).
%o (PARI) Vec((1+x)/(1+x-2*x^2-3*x^3) + O(x^50)) \\ _Michel Marcus_, Aug 28 2015
%K nonn
%O 0,3
%A _N. J. A. Sloane_, Nov 15 2014
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