Generally speaking, tiling of a 2×n rectangle with n dominoes ? Solution

How many ways of tiling a 3×8 rectangle with 12 dominoes ?
Solution

Generally speaking, tiling of a 3×2n rectangle with 3n dominoes ?
Solution

And more ? what about a m×n rectangle ?

How many configurations of a full standard dominoe set of 28 dominoes on a 7×8 rectangle ?
Solution