Number of rooted binary leaf-multilabeled trees with n leaves on the label set [2].
A220819
Number of rooted binary leaf-multilabeled trees with n leaves on the label set [2].
Terms
- a(0) =0a(1) =1a(2) =4a(3) =14a(4) =48a(5) =171a(6) =614a(7) =2270a(8) =8518a(9) =32567a(10) =126168a(11) =495079a(12) =1962752a(13) =7853581a(14) =31672502a(15) =128622480a(16) =525523990a(17) =2158818376a(18) =8911039462a(19) =36941520279a(20) =153740822408a(21) =642085403709
External references
- oeis: A220819