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A170881 a(0)=0; thereafter a(n) = (3*n+1)*2^(n-2)+1. 1
1, 3, 8, 21, 53, 129, 305, 705, 1601, 3585, 7937, 17409, 37889, 81921, 176129, 376833, 802817, 1703937, 3604481, 7602177, 15990785, 33554433, 70254593, 146800641, 306184193, 637534209, 1325400065, 2751463425, 5704253441, 11811160065, 24427626497, 50465865729 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..31.

CROSSREFS

Essentially the first column of the triangular array in A151747.

Sequence in context: A007835 A152086 A014396 * A039671 A267946 A166287

Adjacent sequences:  A170878 A170879 A170880 * A170882 A170883 A170884

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jan 07 2010

STATUS

approved

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Last modified June 16 21:35 EDT 2021. Contains 345080 sequences. (Running on oeis4.)