Find the next number in the number series? 1, 4, 12, 32, ?

Next number of the sequence 1, 4, 12, 32,...

1 = 2 x  $20$

4 = 2 x  $21$

12 = 3 x  $22$

32 = 4 x  $23$

80 = 5 x  $24$.