Number of refinement sequences n -> ... -> {1}^n, where in each step one part is replaced by a partition of itself into two smaller parts (in weakly decreasing order).
A327643
Number of refinement sequences n -> ... -> {1}^n, where in each step one part is replaced by a partition of itself into two smaller parts (in weakly decreasing order).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =3a(4) =6a(5) =24a(6) =84a(7) =498a(8) =2220a(9) =15108a(10) =92328a(11) =773580a(12) =5636460a(13) =53563476a(14) =471562512a(15) =5270698716a(16) =52117937052a(17) =637276396764
External references
- oeis: A327643