Irregular triangle read by rows: T(n,k) = number of set partitions of [1..n] with intertwining weight k.
A226505
Irregular triangle read by rows: T(n,k) = number of set partitions of [1..n] with intertwining weight k.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =14a(5) =1a(6) =42a(7) =9a(8) =1a(9) =132a(10) =55a(11) =14a(12) =2a(13) =429a(14) =286a(15) =120a(16) =35a(17) =6a(18) =1a(19) =1430a(20) =1365a(21) =819a(22) =364a(23) =119a(24) =35a(25) =7a(26) =1a(27) =4862a(28) =6188a(29) =4900
External references
- oeis: A226505