G.f. satisfies: x = A( x + A(x)^2 ).

Terms

a(0) =1a(1) =-1a(2) =4a(3) =-24a(4) =178a(5) =-1512a(6) =14152a(7) =-142705a(8) =1528212a(9) =-17211564a(10) =202460400a(11) =-2474708496a(12) =31310415376a(13) =-408815254832