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%I #7 Jul 31 2015 12:08:28
%S 1,3,7,13,21,29,33,25,-7,-79,-207,-399,-639,-863,-927,-575,577,3009,
%T 7169,13185,20353,26369,26369,12033,-28671,-110079,-244223,-431103,
%U -642047,-795647,-729087,-174079,1243137,3944449,8237057,13987841,20086785,23699457,19423233,-1327103
%N Expansion of (1-x)^(-1)/(1-2*x+2*x^3).
%H <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (3, -2, -2, 2).
%F a(0)=1, a(1)=3, a(2)=7, a(3)=13, a(n)=3*a(n-1)-2*a(n-2)- 2*a(n-3)+ 2*a(n-4) From _Harvey P. Dale_, May 27 2012
%t CoefficientList[Series[(1-x)^(-1)/(1-2 x+2 x^3),{x,0,40}],x] (* or *) LinearRecurrence[{3,-2,-2,2},{1,3,7,13},40] (* _Harvey P. Dale_, May 27 2012 *)
%K sign
%O 0,2
%A _N. J. A. Sloane_, Nov 17 2002
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