Triangle read by rows: T(n,k) is the number of partial idempotent mappings (of an n-chain) with breadth exactly k.
A259760
Triangle read by rows: T(n,k) is the number of partial idempotent mappings (of an n-chain) with breadth exactly k.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =3a(6) =1a(7) =3a(8) =9a(9) =10a(10) =1a(11) =4a(12) =18a(13) =40a(14) =41a(15) =1a(16) =5a(17) =30a(18) =100a(19) =205a(20) =196a(21) =1a(22) =6a(23) =45a(24) =200a(25) =615a(26) =1176a(27) =1057a(28) =1a(29) =7
External references
- oeis: A259760