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%I #6 Feb 18 2016 14:29:33
%S 1,3,4,5,8,17,40,93,208,449,944,1949,3976,8049,16216,32573,65312,
%T 130817,261856,523965,1048216,2096753,4193864,8388125,16776688,
%U 33553857,67108240,134217053,268434728,536870129,1073740984,2147482749
%N a(n) = 2^n-n*(n-2).
%H <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (5,-9,7,-2).
%F G.f.: ( 1-2*x-2*x^2+5*x^3 ) / ( (2*x-1)*(x-1)^3 ). - _R. J. Mathar_, Feb 18 2016
%t Table[2^n-n*(n-2),{n,0,5!}]
%Y Cf. A142974.
%K nonn,easy
%O 0,2
%A _Vladimir Joseph Stephan Orlovsky_, Apr 25 2010
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