G.f. A(x) satisfies A(x) = 1 + x^3*(1+x)^2*A(x)^3.

Terms

a(0) =1a(1) =0a(2) =0a(3) =1a(4) =2a(5) =1a(6) =3a(7) =12a(8) =18a(9) =24a(10) =75a(11) =180a(12) =295a(13) =620a(14) =1612a(15) =3365a(16) =6580a(17) =15365a(18) =35728a(19) =74906a(20) =163099a(21) =379242a(22) =848148a(23) =1848693a(24) =4187193a(25) =9583209a(26) =21417924a(27) =48067371a(28) =109877922a(29) =250010451