Triangle read by rows: T(n,k) = number of unique-valued sequences of length k, n >= 1, 1 <= k <= 2n-3, in the symmetric group S_n.
A097635
Triangle read by rows: T(n,k) = number of unique-valued sequences of length k, n >= 1, 1 <= k <= 2n-3, in the symmetric group S_n.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =18a(4) =12a(5) =24a(6) =456a(7) =5664a(8) =20640a(9) =576a(10) =120a(11) =13560a(12) =1395840
External references
- oeis: A097635