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

Author

Alex Ratushnyak, Dec 11 2013

Keywords

• nonn

Crossrefs

Cf. A000244, A000290, A060505, A062278.

Cf. A233441, A233471.

Programs

Mathematica

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

Python

for n in range(1,100):  print(3**n // n**2, end=", ")

Formula

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