Number T(n,k) of permutations p of [n] such that min_{j=1..n} |p(j)-j| = k; triangle T(n,k), n >= 0, 0 <= k <= floor(n/2), read by rows.
A299789
Number T(n,k) of permutations p of [n] such that min_{j=1..n} |p(j)-j| = k; triangle T(n,k), n >= 0, 0 <= k <= floor(n/2), read by rows.
Terms
- a(0) =0a(1) =1a(2) =1a(3) =1a(4) =4a(5) =2a(6) =15a(7) =8a(8) =1a(9) =76a(10) =40a(11) =4a(12) =455a(13) =236a(14) =28a(15) =1a(16) =3186a(17) =1648a(18) =198a(19) =8a(20) =25487a(21) =13125a(22) =1596a(23) =111a(24) =1a(25) =229384a(26) =117794a(27) =14534a(28) =1152a(29) =16
External references
- oeis: A299789