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
Links
- Vincenzo Librandi, Table of n, a(n) for n = 1..1000
Crossrefs
Cf. A053638.
Programs
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Magma
[Ceiling(4^n/n):n in [1..30]]; // Vincenzo Librandi, Oct 03 2011
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Mathematica
Table[Ceiling[4^n/n],{n,30}] (* Harvey P. Dale, Jan 21 2012 *)