A131135 Denominator of (ordinary) expansion of log((x/2-1)/(x-1)).

1, 2, 8, 24, 64, 160, 128, 896, 2048, 4608, 10240, 22528, 16384, 106496, 229376, 491520, 1048576, 2228224, 524288, 9961472, 4194304, 6291456, 92274688, 192937984, 134217728, 838860800, 1744830464, 3623878656, 7516192768

Offset: 0

Author

Paul Barry, Jun 17 2007

Keywords

• easy
• nonn

Crossrefs

Cf. A090634, A131136.

Formula

a(n) = 2*A090634(n) for n > 0.

a(n) = denominator((1-1/2^n)/n), for n > 0, conjectured. - Michel Marcus, Sep 12 2019