A130105 - OEIS

%I #2 Mar 30 2012 18:59:20

%S 1,-1,4,0,-1344,0,11404800,0,-697426329600,0,184310758195200000,0,

%T -157043899486325440512000,0,355703068713666170585088000000,0,

%U -1866165170959155879636916764672000000,0

%N a(n)=(2n)!*B_n, B_n=n-th Bernoulli number.

%C a(n)=(2n)!*A027641(n)/A027642(n).

%F a(n)=(2n)!*sum{k=0..n,(1/(k+1))*sum{j=0..k,(-1)^j*C(k,j)*j^n}};

%K easy,sign

%O 0,3

%A _Paul Barry_, May 07 2007