T(n,k)=Number of nXk array permutations with each element moved but moved no more than a city block distance of two.

A188981

T(n,k)=Number of nXk array permutations with each element moved but moved no more than a city block distance of two.

Terms

    a(0) =0a(1) =1a(2) =1a(3) =2a(4) =9a(5) =2a(6) =4a(7) =116a(8) =116a(9) =4a(10) =6a(11) =900a(12) =7264a(13) =900a(14) =6a(15) =13a(16) =7836a(17) =295264a(18) =295264a(19) =7836a(20) =13a(21) =24a(22) =71865a(23) =12838276a(24) =54113236a(25) =12838276a(26) =71865a(27) =24a(28) =45a(29) =640513

External references