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Expansion of 1/(1-2*x-3*x^2-3*x^3).
2

%I #8 May 21 2018 15:09:39

%S 1,2,7,23,73,236,760,2447,7882,25385,81757,263315,848056,2731328,

%T 8796769,28331690,91247671,293880719,946499521,3048384212,9817909144,

%U 31620469487,101839819042,327994773977,1056370413541,3402244606139,10957584774832,35291014608704

%N Expansion of 1/(1-2*x-3*x^2-3*x^3).

%H <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (2,3,3).

%o (PARI) Vec(1/(1-2*x-3*x^2-3*x^3)+O(x^99)) \\ _Charles R Greathouse IV_, Sep 27 2012

%Y Partial sums of S(n, x), x=1..17 see A077831 with links. Partial sums of S(n, 18) see A049664.

%K nonn,easy

%O 0,2

%A _N. J. A. Sloane_, Nov 17 2002