Column 1 of triangle A055370.

Terms

a(0) =1a(1) =-1a(2) =1a(3) =-1a(4) =0a(5) =5a(6) =-18a(7) =27a(8) =67a(9) =-496a(10) =496a(11) =6963a(12) =-24246a(13) =-148002a(14) =1138045a(15) =3360042a(16) =-58828040a(17) =-33243252a(18) =3312139446a(19) =-5235582541a(20) =-204462055464a(21) =726496668085