The answer is 8,388,608
the answer would be 2097152! each term is multiplied by 4.
(5) 128x4=512
(6) 512x4=2048
(7) 2048x4=8192
(8) 8192x4=32768
(9) 32768x4=131072
(10) 131072x4=524288
(11) 524288x4=2097152
