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A132477 Row sums of triangle A132476. 2
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

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

LINKS

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

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: A278355 A160619 A330011 * A102651 A102652 A279626

Adjacent sequences:  A132474 A132475 A132476 * A132478 A132479 A132480

KEYWORD

nonn

AUTHOR

Gary W. Adamson, Aug 22 2007

STATUS

approved

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Last modified July 24 18:34 EDT 2021. Contains 346273 sequences. (Running on oeis4.)