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Denominator of Bernoulli(n, -1/2).
4

%I #6 Mar 19 2014 05:46:08

%S 1,1,12,4,240,16,1344,64,3840,256,33792,1024,5591040,4096,49152,16384,

%T 16711680,65536,104595456,262144,173015040,1048576,289406976,4194304,

%U 22900899840,16777216,201326592,67108864,116769423360,268435456

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

%H Vincenzo Librandi, <a href="/A157782/b157782.txt">Table of n, a(n) for n = 0..250</a>

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

%Y For numerators see A157781.

%K nonn,frac

%O 0,3

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