A059165 a(n) = (n+1)*2^(n+4).

0, 16, 64, 192, 512, 1280, 3072, 7168, 16384, 36864, 81920, 180224, 393216, 851968, 1835008, 3932160, 8388608, 17825792, 37748736, 79691776, 167772160, 352321536, 738197504, 1543503872, 3221225472, 6710886400, 13958643712

Offset

-1,2

Comments

A hierarchical sequence (S(W'3{2,2}*cc) - see A059126).

Generating floretion: AB + BA with A = .5'i + .5'ii' + .5'ij' + .5'ik' and B = - .5'j + .5'k - .5j' + .5k' - 'ii' - .5'ij' - .5'ik' - .5'ji' - .5'ki'. - Creighton Dement, Dec 19 2004

Links

Harry J. Smith, Table of n, a(n) for n = -1..200

Jonas Wallgren, Hierarchical sequences, 2001.

Index entries for linear recurrences with constant coefficients, signature (4,-4).

Formula

G.f.: 16/(2*x-1)^2.

a(n) = 4*A058922(n+2) = 16*A001787(n+1). - Philippe Deléham, Apr 21 2009

From Amiram Eldar, Jan 13 2021: (Start)

Sum_{n>=0} 1/a(n) = log(2)/8.

Sum_{n>=0} (-1)^n/a(n) = log(3/2)/8. (End)

Mathematica

Table[2^(n+4)*(n+1), {n, -1, 100}] (* Vladimir Joseph Stephan Orlovsky, Jan 15 2011 *)
LinearRecurrence[{4, -4}, {0, 16}, 30] (* Harvey P. Dale, Oct 29 2019 *)

Prog

(PARI) a(n) = shift(n+1, n+4)
(PARI) a(n) = { (n + 1)*2^(n + 4) } \\ Harry J. Smith, Jun 25 2009

Crossrefs

Cf. A001787, A058922.

Sequence in context: A190099 A316542 A306057 * A212506 A212512 A317235

Adjacent sequences: A059162 A059163 A059164 * A059166 A059167 A059168

Keyword

easy,nonn,changed

Author

Jonas Wallgren, Feb 02 2001

Extensions

More terms from Benoit Cloitre, Apr 07 2002

Edited by N. J. A. Sloane, Apr 16 2008 at the suggestion of Vim Wenders

Status

approved