A145119 a(n) = Product_{k=1..n-1} (ceiling(n/k) - ceiling(n/k) mod 2).

1, 2, 4, 16, 32, 96, 384, 1024, 2048, 10240, 30720, 73728, 294912, 688128, 1835008, 12582912, 25165824, 56623104, 283115520, 629145600, 1887436800, 11072962560, 26575110144, 57982058496, 231928233984, 753766760448, 1758789107712

Offset

1,2

Comments

Bounded by A010786 and A131385.

Each term has many more factors of two than any other prime factor.

Links

Table of n, a(n) for n=1..27.

Prog

(PARI) a(n) = prod(k=1, n-1, ceil(n/k) - ceil(n/k) % 2); \\ Michel Marcus, Nov 17 2019

Crossrefs

Cf. A010786, A131385, A131387.

Sequence in context: A171381 A334083 A274497 * A081411 A269758 A094384

Adjacent sequences: A145116 A145117 A145118 * A145120 A145121 A145122

Keyword

easy,nonn

Author

Reikku Kulon, Oct 02 2008

Status

approved