486248000

Appears in sequences

• The number of tilings of a 4 X n rectangle using integer length rectangles with at least one side of length 1, i.e., tiles are 1 X 1, 1 X 2, ..., 1 X n, 2 X 1, 3 X 1, 4 X 1.at n=7A254125
• Number of tilings of a 7 X n rectangle using polyominoes of shape I.at n=4A254607