For the central one, we have to multiply the Python by -2, so we've got -2, 4, -2, which boils down to 1 times the value 2 steps to the left minus 4 times the value 1 step to the left 6 times the value at the center minus 4 times the value of 1 step to the right and 1 times the value 2 steps to the right. 