

A165421


a(1) = 1, a(2) = 3, a(n) = product of the previous terms for n >= 3.


5




OFFSET

1,2


COMMENTS

Essentially a duplicate of A011764.  N. J. A. Sloane, Oct 06 2009


LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..14


FORMULA

a(1) = 1, a(2) = 3, a(n) = product_{i=1..n1} a(i), n >= 3. a(1) = 1, a(2) = 3, a(n) = A000244(2^(n3)) = A011764(n3) = 3^(2^(n3)), n >= 3. a(1) = 1, a(2) = 3, a(3) = 3, a(n) = (a(n1))^2, n >= 4.


CROSSREFS

Sequence in context: A257627 A115564 A122961 * A227432 A100731 A072004
Adjacent sequences: A165418 A165419 A165420 * A165422 A165423 A165424


KEYWORD

nonn


AUTHOR

Jaroslav Krizek, Sep 17 2009


STATUS

approved



