T(n,k) is the number of permutations of [n] having exactly k pairs of integers i<j in [n] such that their cycle minima have opposite sorting order; triangle T(n,k), n>=0, 0<=k<=A125811(n)-1, read by rows.
A381529
T(n,k) is the number of permutations of [n] having exactly k pairs of integers i<j in [n] such that their cycle minima have opposite sorting order; triangle T(n,k), n>=0, 0<=k<=A125811(n)-1, read by rows.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =1a(5) =15a(6) =5a(7) =4a(8) =54a(9) =21a(10) =24a(11) =16a(12) =5a(13) =235a(14) =89a(15) =118a(16) =112a(17) =101a(18) =35a(19) =28a(20) =2a(21) =1237a(22) =408a(23) =577a(24) =633a(25) =719a(26) =585a(27) =402a(28) =239a(29) =167
External references
- oeis: A381529