King's Procession
On a chessboard, a king is to be allowed to move one square at a time: horizontally to the right, vertically downward, or diagonally to the right and downward.
Imagine a 4x4 chessboard, with the king beginning in the top-left square. By how many routes can he reach the bottom-right square?
By how many routes can a similar journey be made on a full 8x8 chessboard?