There is a sequence: 1,2,2,4,3,8,4,16,5... Then its 100th term is

There is a sequence: 1,2,2,4,3,8,4,16,5... Then its 100th term is

The odd number terms are 1,2,3,4
Even items are 2 ^ 1,2 ^ 2,2 ^ 3
Item 100 is even, so item 100 is 2 ^ 50