A168495 a(n) = 3^floor(n^2/3).
1, 1, 3, 27, 243, 6561, 531441, 43046721, 10460353203, 7625597484987, 5559060566555523, 12157665459056928801, 79766443076872509863361, 523347633027360537213511521, 10301051460877537453973547267843
Offset: 0
Links
- Vincenzo Librandi, Table of n, a(n) for n = 0..79
Programs
-
Magma
[3^Floor(n^2/3): n in [0..15]]; // Vincenzo Librandi, Sep 15 2011
-
Mathematica
Table[3^Floor[n^2/3], {n,0,20}] (* G. C. Greubel, Sep 18 2018 *) -
PARI
vector(20, n, n--; 3^floor(n^2/3)) \\ G. C. Greubel, Sep 18 2018
Formula
a(n) = 9*a(n-1)*a(n-3)/a(n-4).
Comments