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

Terms

a(0) =1a(1) =0a(2) =-1a(3) =3a(4) =-4a(5) =-9a(6) =73a(7) =-212a(8) =111a(9) =1956a(10) =-10078a(11) =21466a(12) =29823a(13) =-418183a(14) =1561911a(15) =-1722963a(16) =-13205004a(17) =86962328a(18) =-232448945a(19) =-109578204a(20) =3849218852a(21) =-17135183489a(22) =27800381006a(23) =113891855632a(24) =-966644138742a(26) =-833503324311