%I A027644
%S A027644 1,4,36,24,450,40,2205,168,350,120,38115,88,40990950,10920,
%T A027644 5005,24,130180050,136,1935088155,3192,177827650,1320,1539340803,
%U A027644 184,304521767550,10920,37182145,24,2814316555050,1160
%N A027644 Denominators of poly-Bernoulli numbers B_n^(k) with k=2.
%D A027644 M. Kaneko, Poly-Bernoulli numbers, J. Theorie des Nombres Bordeaux 9 
               (1997), 221-228.
%H A027644 <a href="Sindx_Be.html#Bernoulli">Index entries for sequences related 
               to Bernoulli numbers.</a>
%H A027644 M. Kaneko, <a href="http://ftp.linux.cz/mount/muni.cz/EMIS/journals/JTNB/
               1997-1/kaneko.ps">Poly-Bernoulli numbers</a>
%p A027644 (-1)^n*sum( (-1)^'m'*'m'!*stirling2(n,'m')/('m'+1)^k,'m'=0..n);
%t A027644 f[n_] := (-1)^n*Sum[(-1)^m*m!*StirlingS2[n, m]/(m + 1)^2, {m, 0, n}]; 
               Table[ Denominator[ f[n]], {n, 0, 30}] (from Robert G. Wilson v Oct 
               28 2004)
%Y A027644 Cf. A027643.
%Y A027644 Sequence in context: A092960 A144153 A144162 this_sequence A062182 A073771 
               A091722
%Y A027644 Adjacent sequences: A027641 A027642 A027643 this_sequence A027645 A027646 
               A027647
%K A027644 nonn
%O A027644 0,2
%A A027644 N. J. A. Sloane (njas(AT)research.att.com).