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

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =5a(5) =14a(6) =30a(7) =82a(8) =203a(9) =552a(10) =1458a(11) =4004a(12) =10956a(13) =30514a(14) =85259a(15) =240507a(16) =681571a(17) =1943472a(18) =5565744a(19) =16011492a(20) =46233297a(21) =133975566a(22) =389455910a(23) =1135431759a(24) =3319060758a(25) =9726061473a(26) =28565447104a(27) =84073146827a(28) =247924840773a(29) =732439856638