A230664 a(n) = floor(3^n/n^2).

3, 2, 3, 5, 9, 20, 44, 102, 243, 590, 1464, 3690, 9433, 24402, 63772, 168151, 446851, 1195742, 3219560, 8716961, 23719621, 64836900, 177964421, 490329056, 1355661775, 3760156550, 10460353203, 29179582212, 81605680576, 228767924549, 642740266684, 1809590028175

Offset

1,1

Links

Table of n, a(n) for n=1..32.

Formula

a(n) = floor(A000244(n)/A000290(n)).

Mathematica

Table[Floor[3^n/n^2], {n, 40}] (* Wesley Ivan Hurt, Apr 25 2023 *)

Prog

(Python)
for n in range(1, 100):  print str(3**n // n**2)+', ',

Crossrefs

Cf. A000244, A000290, A060505, A062278.

Cf. A233441, A233471.

Sequence in context: A243109 A206012 A211940 * A175717 A051701 A225696

Adjacent sequences: A230661 A230662 A230663 * A230665 A230666 A230667

Keyword

nonn

Author

Alex Ratushnyak, Dec 11 2013

Status

approved