Generalized Stirling2 array (-1,2)S2. Irregular triangle a(n, m) for n >= 1 and 2 <= m <= 2*n.

Terms

a(0) =1a(1) =2a(2) =-2a(3) =1a(4) =40a(5) =-40a(6) =20a(7) =-6a(8) =1a(9) =2240a(10) =-2240a(11) =1120a(12) =-360a(13) =80a(14) =-12a(15) =1a(16) =246400a(17) =-246400a(18) =123200a(19) =-40320a(20) =9520a(21) =-1680a(22) =220a(23) =-20a(24) =1a(25) =44844800a(26) =-44844800a(27) =22422400a(28) =-7392000a(29) =1786400