T(n,k) = number of n X k array permutations with each element not moved or moved diagonally or antidiagonally by one.
A189280
T(n,k) = number of n X k array permutations with each element not moved or moved diagonally or antidiagonally by one.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =4a(5) =1a(6) =1a(7) =9a(8) =9a(9) =1a(10) =1a(11) =25a(12) =45a(13) =25a(14) =1a(15) =1a(16) =64a(17) =225a(18) =225a(19) =64a(20) =1a(21) =1a(22) =169a(23) =1125a(24) =2704a(25) =1125a(26) =169a(27) =1a(28) =1a(29) =441
External references
- oeis: A189280