Number of rooted trees of nonempty sets with n points. (Each node is a set of 1 or more points.)
A036249
Number of rooted trees of nonempty sets with n points. (Each node is a set of 1 or more points.)
Terms
- a(0) =0a(1) =1a(2) =2a(3) =5a(4) =13a(5) =37a(6) =108a(7) =332a(8) =1042a(9) =3360a(10) =11019a(11) =36722a(12) =123875a(13) =422449a(14) =1453553a(15) =5040816a(16) =17599468a(17) =61814275a(18) =218252584a(19) =774226549a(20) =2758043727a(21) =9862357697a(22) =35387662266a(23) =127374191687a(24) =459783039109
External references
- oeis: A036249