Column 1 of triangle A055347.

Terms

a(0) =1a(1) =-1a(2) =1a(3) =0a(4) =-3a(5) =4a(6) =25a(7) =-98a(8) =-543a(9) =4310a(10) =26980a(11) =-332265a(12) =-2797178a(13) =42158122a(14) =524926934a(15) =-7967880874a(16) =-158385569345