Column 0 of triangle A055905.

Terms

a(0) =1a(1) =-1a(2) =2a(3) =-5a(4) =12a(5) =-17a(6) =-62a(7) =677a(8) =-2840a(9) =-1451a(10) =119954a(11) =-866857a(12) =472540a(13) =52538185a(14) =-517302474a(15) =410579683a(16) =47022181040a(17) =-542323525061a(18) =101360204230