Number of rooted binary MUL-trees with n leaves on the label set [4].
A220817
Number of rooted binary MUL-trees with n leaves on the label set [4].
Terms
- a(0) =4a(1) =10a(2) =40a(3) =215a(4) =1260a(5) =8010a(6) =53240a(7) =366680a(8) =2590420a(9) =18674660a(10) =136809240a(11) =1015603015a(12) =7622900360a(13) =57753364510a(14) =441081947840
External references
- oeis: A220817