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) =10a(4) =35a(5) =134a(6) =544a(7) =2288a(8) =9907a(9) =43830a(10) =197300a(11) =900738a(12) =4160521a(13) =19408084a(14) =91302317a(15) =432663728a(16) =2063421045a(17) =9896113574a(18) =47698770359a(19) =230932635206