Column 2 of triangle A117335.

Terms

a(0) =0a(1) =0a(2) =1a(3) =-4a(4) =24a(5) =-157a(6) =1176a(7) =-9853a(8) =91498a(9) =-933451a(10) =10386908a(11) =-125292129a(12) =1629597910a(13) =-22746009423a(14) =339288465552