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A134062 Row sums of triangle A134061. 1
1, 8, 18, 38, 78, 158, 318, 638, 1278, 2558 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

COMMENTS

a(n) = rightmost term of the matrix-vector product M*V, where M = the 3x3 matrix [1,0,0; 0,1,0; 1,1,2] and V = [1,1,3].

FORMULA

Binomial transform of (1,7,3,7,3,7,3,...).

EXAMPLE

a(2) = 18 = sum of row 2 terms, triangle A134061: (3 + 10 + 5).

a(3) = 38 = (1, 3, 3, 1) dot (1, 7, 3, 7) = (1 + 21 + 9 + 7).

MATHEMATICA

a=8; lst={1, a}; k=10; Do[a+=k; AppendTo[lst, a]; k+=k, {n, 0, 5!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Dec 17 2008]

CROSSREFS

Cf. A134061.

Sequence in context: A098944 A129958 A082227 * A067563 A123134 A096283

Adjacent sequences:  A134059 A134060 A134061 * A134063 A134064 A134065

KEYWORD

nonn

AUTHOR

Gary W. Adamson (qntmpkt(AT)yahoo.com), Oct 05 2007

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Last modified February 16 04:47 EST 2012. Contains 205860 sequences.