Q(3,n), where Q(m,k) is defined in A127080 and A127137.

Terms

a(0) =1a(1) =1a(2) =1a(3) =-2a(4) =-9a(5) =4a(6) =75a(7) =24a(8) =-735a(9) =-816a(10) =8505a(11) =17760a(12) =-114345a(13) =-388800a(14) =1756755a(15) =9233280a(16) =-30405375a(17) =-242968320a(18) =585810225a(19) =7125511680a(20) =-12439852425a(21) =-232838323200a(22) =288735522075