A132477 Row sums of triangle A132476.

1, 4, 12, 24, 48, 96, 192, 384, 768, 1536, 3072, 6144, 12288, 24576, 49152, 98304, 196608, 393216, 786432, 1572864, 3145728, 6291456, 12582912, 25165824, 50331648, 100663296, 201326592, 402653184, 805306368, 1610612736, 3221225472, 6442450944, 12884901888

Offset

0,2

Comments

A007283 = 3*2^n: (3, 6, 12, 24, 48, ...).

Links

Table of n, a(n) for n=0..32.

Index entries for linear recurrences with constant coefficients, signature (2).

Formula

a(0) = 1, a(1) = 4, a(n) = 3*2^n for n>1.

G.f.: -(1+2*x+4*x^2)/(-1+2*x). - R. J. Mathar, Nov 14 2007

a(n) = 2*a(n-1) for n>1. - Harvey P. Dale, May 31 2017

Example

a(3) = 24 = sum of row 3 terms of triangle A132476: (3 + 7 + 13 + 1).

Mathematica

Join[{1, 4}, 3 2^Range[2, 40]] (* or *) Join[{1, 4}, NestList[2#&, 12, 40]] (* Harvey P. Dale, May 31 2017 *)

Crossrefs

Cf. A132476, A007283.

Sequence in context: A160619 A352668 A330011 * A102651 A102652 A279626

Adjacent sequences: A132474 A132475 A132476 * A132478 A132479 A132480

Keyword

nonn

Author

Gary W. Adamson, Aug 22 2007

Status

approved