A129794 a(n) = floor(4^n/n).

4, 8, 21, 64, 204, 682, 2340, 8192, 29127, 104857, 381300, 1398101, 5162220, 19173961, 71582788, 268435456, 1010580540, 3817748707, 14467258260, 54975581388, 209430786243, 799644820200, 3059510616420, 11728124029610

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..300

Mathematica

Table[Floor[4^n/n], {n, 25}] (* Harvey P. Dale, Jul 24 2011 *)

Prog

(Magma)[Floor(4^n / n): n in [1..35]]; // Vincenzo Librandi, May 08 2011
(Python)
def A129794(n): return (1<<(n<<1))//n # Chai Wah Wu, Aug 24 2023

Crossrefs

Cf. A000799, A092763, A053638.

Sequence in context: A003608 A248423 A319565 * A370956 A064503 A050482

Adjacent sequences: A129791 A129792 A129793 * A129795 A129796 A129797

Keyword

nonn

Author

Mohammad K. Azarian, May 18 2007

Status

approved