T(n,k)=Number of nXk array permutations with each element remaining in its original row or its original column.

A188808

T(n,k)=Number of nXk array permutations with each element remaining in its original row or its original column.

Terms

    a(0) =1a(1) =2a(2) =2a(3) =6a(4) =9a(5) =6a(6) =24a(7) =82a(8) =82a(9) =24a(10) =120a(11) =1313a(12) =2720a(13) =1313a(14) =120a(15) =720a(16) =32826a(17) =194568a(18) =194568a(19) =32826a(20) =720a(21) =5040a(22) =1181737a(23) =26101232a(24) =72104097a(25) =26101232a(26) =1181737a(27) =5040a(28) =40320a(29) =57905114

External references