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(2+n)*2^n-2-3*n.
3

%I #9 Jun 13 2015 00:52:23

%S 1,8,29,82,207,492,1129,2534,5603,12256,26589,57306,122839,262100,

%T 557009,1179598,2490315,5242824,11009989,23068610,48234431,100663228,

%U 209715129,436207542,905969587

%N (2+n)*2^n-2-3*n.

%C Row sums of triangle A131437.

%H <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (6,-13,12,-4).

%F Binomial transform of A131439.

%F G.f.: -x*(-1-2*x+6*x^2) / ( (2*x-1)^2*(x-1)^2 ). - R. J. Mathar, Sep 24 2011

%e a(3) = 19 = sum of row 3 terms of triangle A131437: (7 + 9 + 13).

%Y Cf. A131436, A131437, A131439.

%K nonn,easy

%O 1,2

%A _Gary W. Adamson_, Jul 11 2007

%E Definition replaced by formula. - R. J. Mathar, Sep 24 2011