T(n,k)=Number of permutations of an nXk array with each element moving exactly one horizontally or vertically and without 2-loops.
A216800
T(n,k)=Number of permutations of an nXk array with each element moving exactly one horizontally or vertically and without 2-loops.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =2a(5) =0a(6) =0a(7) =2a(8) =2a(9) =0a(10) =0a(11) =6a(12) =0a(13) =6a(14) =0a(15) =0a(16) =10a(17) =8a(18) =8a(19) =10a(20) =0a(21) =0a(22) =22a(23) =0a(24) =88a(25) =0a(26) =22a(27) =0a(28) =0a(29) =42
External references
- oeis: A216800