Number of refinement sequences n -> ... -> {1}^n, where in each step exactly one part is replaced by a partition of itself into smaller parts (in weakly decreasing order).
A327698
Number of refinement sequences n -> ... -> {1}^n, where in each step exactly one part is replaced by a partition of itself into smaller parts (in weakly decreasing order).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =17a(5) =74a(6) =300a(7) =1755a(8) =9360a(9) =65510a(10) =442117a(11) =3802889a(12) =30213386a(13) =294892947a(14) =2789021105a(15) =31360525517a(16) =334374848070
External references
- oeis: A327698