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

Terms

a(0) =1a(1) =2a(2) =3a(3) =8a(4) =19a(5) =50a(6) =137a(7) =380a(8) =1088a(9) =3152a(10) =9270a(11) =27576a(12) =82794a(13) =250700a(14) =764454a(15) =2345688a(16) =7237318a(17) =22438988a(18) =69876356a(19) =218456216a(20) =685400835a(21) =2157396738a(22) =6810801959a(23) =21559694364a(24) =68417766207a(25) =217617573110a(26) =693655532081