Find the next number in the sequence.
2, 16, 384, 18432, ?
147660
147560
1434560
1474560
None of these
(2 × 2) + (2 × 2) × 3 = 16
(16 × 4) + (16 × 4) × 5 = 384
(384 × 6) + (384 × 6) × 7 = 18432
(18432 × 8) + (18432 × 8) × 9 = 1474560
50, 49, 49, 48, 48, 47, ?
21, 9, 21, 11, 21, 13, 21, __
2, 3, 8, 63, __