A233441 a(n) = floor(2^n / n^3).

2, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 3, 5, 9, 16, 26, 44, 76, 131, 226, 393, 689, 1213, 2147, 3818, 6818, 12228, 22012, 39768, 72084, 131072, 239027, 437102, 801393, 1472896, 2713342, 5009438, 9267786, 17179869, 31906432, 59362467, 110632938, 206519839, 386111079

Offset

1,1

Links

Paolo Xausa, Table of n, a(n) for n = 1..1000

Formula

a(n) = floor(A000079(n) / A000578(n)).

Mathematica

Array[Floor[2^#/#^3] &, 50] (* Paolo Xausa, Mar 27 2025 *)

Prog

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

Crossrefs

Cf. A000079, A000578, A060505, A062278.

Cf. A230664, A233442.

Sequence in context: A181011 A084863 A368072 * A380986 A255365 A256505

Adjacent sequences: A233438 A233439 A233440 * A233442 A233443 A233444

Keyword

nonn

Author

Alex Ratushnyak, Dec 09 2013

Status

approved