Triangle read by columns: T(n,k) is the number of functions from an n-element set to a k-element set that are not one-to-one, k>=n>=1.
A347034
Triangle read by columns: T(n,k) is the number of functions from an n-element set to a k-element set that are not one-to-one, k>=n>=1.
Terms
- a(0) =0a(1) =0a(2) =2a(3) =0a(4) =3a(5) =21a(6) =0a(7) =4a(8) =40a(9) =232a(10) =0a(11) =5a(12) =65a(13) =505a(14) =3005a(15) =0a(16) =6a(17) =96a(18) =936a(19) =7056a(20) =45936a(21) =0a(22) =7a(23) =133a(24) =1561a(25) =14287a(26) =112609a(27) =818503a(28) =0a(29) =8
External references
- oeis: A347034