Number of mobiles (cycle rooted trees) with n generators.

Terms

a(0) =1a(1) =2a(2) =5a(3) =16a(4) =54a(5) =210a(6) =841a(7) =3555a(8) =15402a(9) =68336a(10) =308206a(11) =1410175a(12) =6525500a(13) =30492934a(14) =143669529a(15) =681781043a(16) =3255653089a(17) =15632422715a(18) =75429279214a(19) =365556955492