A208147 Sequence generated from A089080.

1, 2, 6, 12, 48, 96, 288, 576, 2880, 5760, 17280, 34560, 138240, 276480, 829440, 1658880, 9953280, 19906560, 59719680, 119439360, 477757440, 955514880, 2866544640, 5733089280, 28665446400, 57330892800, 171992678400, 343985356800, 1375941427200, 2751882854400

Offset

1,2

Links

Alois P. Heinz, Table of n, a(n) for n = 1..2268

Formula

a(1) = 1; for n>1, a(n) = A089080(n) * a(n-1).

a(n) = (2*n-1)!/A067281(2*n-1). - Alois P. Heinz, Dec 11 2023

a(n) = Product_{k=1..2*n-2} A001511(k). - Ridouane Oudra, Nov 24 2024

Example

a(5) = 48 = A089080(5) * a(4) = 4 * 12.

Maple

seq(mul(padic[ordp](2*k, 2), k=1..2*n-2), n=1..40); # Ridouane Oudra, Nov 24 2024

Crossrefs

Cf. A000142, A067281, A089080, A001511.

Sequence in context: A177834 A169858 A292132 * A369330 A152873 A175810

Adjacent sequences: A208144 A208145 A208146 * A208148 A208149 A208150

Keyword

nonn,easy

Author

Gary W. Adamson, Feb 23 2012

Status

approved