A131438 (2+n)*2^n-2-3*n.

1, 8, 29, 82, 207, 492, 1129, 2534, 5603, 12256, 26589, 57306, 122839, 262100, 557009, 1179598, 2490315, 5242824, 11009989, 23068610, 48234431, 100663228, 209715129, 436207542, 905969587

Offset

1,2

Comments

Row sums of triangle A131437.

Links

Table of n, a(n) for n=1..25.

Index entries for linear recurrences with constant coefficients, signature (6,-13,12,-4).

Formula

Binomial transform of A131439.

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

Example

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

Crossrefs

Cf. A131436, A131437, A131439.

Sequence in context: A046664 A333510 A055536 * A048478 A001360 A294838

Adjacent sequences: A131435 A131436 A131437 * A131439 A131440 A131441

Keyword

nonn,easy

Author

Gary W. Adamson, Jul 11 2007

Extensions

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

Status

approved