Column 0 of A048805.

Terms

a(0) =1a(1) =-1a(2) =1a(3) =-1a(4) =0a(5) =4a(6) =-24a(7) =104a(8) =-88a(9) =42a(10) =536a(11) =-7536a(12) =32230a(13) =-207052a(14) =791194a(15) =3748874a(16) =-15956672a(17) =224309712a(18) =-757708060a(19) =5189018388a(20) =-172716308a(21) =-386018261228