A129788 a(n) = ceiling(4^n/n).

4, 8, 22, 64, 205, 683, 2341, 8192, 29128, 104858, 381301, 1398102, 5162221, 19173962, 71582789, 268435456, 1010580541, 3817748708, 14467258261, 54975581389, 209430786244, 799644820201, 3059510616421, 11728124029611

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Mathematica

Table[Ceiling[4^n/n], {n, 30}] (* Harvey P. Dale, Jan 21 2012 *)

Prog

(Magma) [Ceiling(4^n/n):n in [1..30]]; // Vincenzo Librandi, Oct 03 2011

Crossrefs

Cf. A053638.

Sequence in context: A266922 A284778 A057583 * A170938 A003684 A338310

Adjacent sequences: A129785 A129786 A129787 * A129789 A129790 A129791

Keyword

nonn,easy

Author

Mohammad K. Azarian, May 18 2007

Status

approved