G.f. satisfies A(x) = 1 / (1 + x*(1 + x*A(x))^5).

Terms

a(0) =1a(1) =-1a(2) =-4a(3) =4a(4) =51a(5) =-6a(6) =-770a(7) =-694a(8) =12363a(9) =25583a(10) =-198824a(11) =-701944a(12) =3049603a(13) =17238467a(14) =-41348631a(15) =-396817391a(16) =391720363a(17) =8689985437a(18) =1902247845a(19) =-181526287908a(20) =-253530149234