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
Keywords
Links
- Vincenzo Librandi, Table of n, a(n) for n = 1..300
Programs
-
Magma
[Floor(4^n / n): n in [1..35]]; // Vincenzo Librandi, May 08 2011
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Mathematica
Table[Floor[4^n/n],{n,25}] (* Harvey P. Dale, Jul 24 2011 *) -
Python
def A129794(n): return (1<<(n<<1))//n # Chai Wah Wu, Aug 24 2023