Number T(n,k) of permutations p of [n] such that |p(j)-j| >= k (for all j in [n]); triangle T(n,k), n >= 0, 0 <= k <= floor(n/2), read by rows.
A306543
Number T(n,k) of permutations p of [n] such that |p(j)-j| >= k (for all j in [n]); triangle T(n,k), n >= 0, 0 <= k <= floor(n/2), read by rows.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =1a(4) =6a(5) =2a(6) =24a(7) =9a(8) =1a(9) =120a(10) =44a(11) =4a(12) =720a(13) =265a(14) =29a(15) =1a(16) =5040a(17) =1854a(18) =206a(19) =8a(20) =40320a(21) =14833a(22) =1708a(23) =112a(24) =1a(25) =362880a(26) =133496a(27) =15702a(28) =1168a(29) =16
External references
- oeis: A306543