G.f. A(x) satisfies: A(x) = 1 - x * A(x/(1 - x)) / (1 - x)^4.

Terms

a(0) =1a(1) =-1a(2) =-3a(3) =-2a(4) =15a(5) =62a(6) =56a(7) =-566a(8) =-3318a(9) =-6241a(10) =33022a(11) =330939a(12) =1211873a(13) =-1330691a(14) =-47459905a(15) =-310788796a(16) =-675462411a(17) =7151217040a(18) =93213242926a(19) =515144576280a(20) =122725585740