Number of unrooted binary leaf-multi-labeled trees with n leaves on the label set [3].
A220827
Number of unrooted binary leaf-multi-labeled trees with n leaves on the label set [3].
Terms
- a(0) =3a(1) =6a(2) =10a(3) =21a(4) =63a(5) =227a(6) =891a(7) =3876a(8) =17790a(9) =85536a(10) =424926a(11) =2169376a(12) =11312838a(13) =60065901a(14) =323746095a(15) =1767667332a(16) =9760149468a(17) =54422364834a(18) =306101712771
External references
- oeis: A220827