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Denominator of Bernoulli(n, 1/2).
6

%I #10 Jan 01 2023 09:05:07

%S 1,1,12,1,240,1,1344,1,3840,1,33792,1,5591040,1,49152,1,16711680,1,

%T 104595456,1,173015040,1,289406976,1,22900899840,1,201326592,1,

%U 116769423360,1,7689065201664,1,1095216660480,1,51539607552,1

%N Denominator of Bernoulli(n, 1/2).

%C Included for completeness, A033469 is the official version of this sequence.

%H Vincenzo Librandi, <a href="/A157780/b157780.txt">Table of n, a(n) for n = 0..250</a>

%F a(n) = denominator(-(1-2^(1-n))*Bernoulli(n)). - _Fabián Pereyra_, Dec 31 2022

%t Table[Denominator[BernoulliB[n, 1/2]], {n, 0, 50}] (* _Vincenzo Librandi_, Mar 19 2014 *)

%Y For numerators see A157779.

%K nonn,frac

%O 0,3

%A _N. J. A. Sloane_, Nov 08 2009