Column 1 of triangle A117335.

Terms

a(0) =0a(1) =1a(2) =-1a(3) =6a(4) =-27a(5) =164a(6) =-1133a(7) =8930a(8) =-78739a(9) =768276a(10) =-8221025a(11) =95775678a(12) =-1207356591a(13) =16381797128a(14) =-238127430413