OFFSET
0,3
COMMENTS
Hankel transform of A168494. Trivial Somos-4 sequence linked to elliptic curve y^2=1-10x+25x^2-12x^3.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..79
FORMULA
a(n) = 9*a(n-1)*a(n-3)/a(n-4).
MATHEMATICA
Table[3^Floor[n^2/3], {n, 0, 20}] (* G. C. Greubel, Sep 18 2018 *)
PROG
(Magma) [3^Floor(n^2/3): n in [0..15]]; // Vincenzo Librandi, Sep 15 2011
(PARI) vector(20, n, n--; 3^floor(n^2/3)) \\ G. C. Greubel, Sep 18 2018
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Paul Barry, Nov 27 2009
STATUS
approved