Number of uniform rooted trees with n nodes.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =8a(5) =15a(6) =35a(7) =72a(8) =169a(9) =388a(10) =934a(11) =2234a(12) =5508a(13) =13557a(14) =33883a(15) =85017a(16) =215091a(17) =546496a(18) =1396524a(19) =3582383a(20) =9228470a(21) =23852918a(22) =61857180a(23) =160871716a(24) =419516462a(25) =1096671326a(26) =2873403980a(27) =7544428973a(28) =19847520789a(29) =52308750878