1622723

Appears in sequences

• Number T(n,k) of tilings of a 5 X n rectangle with pentominoes of any shape and exactly k pentominoes of shape X; triangle T(n,k), n>=0, read by rows.at n=15A247711
• Number of tilings of a 5 X n rectangle using n pentominoes of any but the X shape.at n=8A247775