Column 2 of triangle in A144633.

Terms

a(0) =0a(1) =0a(2) =1a(3) =-3a(4) =11a(5) =-45a(6) =175a(7) =-315a(8) =-6265a(9) =139755a(10) =-2127125a(11) =28153125a(12) =-327452125a(13) =2921393475a(14) =-2998820825a(15) =-788463550875