A094971 a(n) = floor(9^n/2^n).
1, 4, 20, 91, 410, 1845, 8303, 37366, 168151, 756680, 3405062, 15322783, 68952523, 310286355, 1396288601, 6283298708, 28274844190, 127236798856, 572565594852, 2576545176835, 11594453295761, 52175039830928, 234787679239180
Offset: 0
Links
- Vincenzo Librandi, Table of n, a(n) for n = 0..900
Programs
-
Magma
[Floor(9^n / 2^n): n in [0..30]]; // Vincenzo Librandi, Sep 08 2011
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Mathematica
Table[ Floor[(9/2)^n], {n, 0, 30}] -
PARI
a(n)=9^n>>n \\ Charles R Greathouse IV, Feb 04 2016