A089143 a(n) = 9*2^n - 6.

3, 12, 30, 66, 138, 282, 570, 1146, 2298, 4602, 9210, 18426, 36858, 73722, 147450, 294906, 589818, 1179642, 2359290, 4718586, 9437178, 18874362, 37748730, 75497466, 150994938, 301989882, 603979770, 1207959546, 2415919098, 4831838202, 9663676410, 19327352826

Offset

0,1

Links

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

Formula

a(n) = 3*A033484(n).

Mathematica

a=3; lst={a}; k=9; Do[a+=k; AppendTo[lst, a]; k+=k, {n, 0, 5!}]; lst (* Vladimir Joseph Stephan Orlovsky, Dec 16 2008 *)
9*2^Range[0, 40]-6 (* Harvey P. Dale, Sep 15 2013 *)

Crossrefs

Cf. A033484.

Sequence in context: A064181 A281434 A296289 * A073952 A107231 A363913

Adjacent sequences: A089140 A089141 A089142 * A089144 A089145 A089146

Keyword

nonn

Author

Parthasarathy Nambi, Sep 21 2004

Status

approved