Worst luck
Alice is playing a game where you have to guess numbers however she is having the worst luck. Maybe if she analize the sequence maybe she can predict the future
parity increase
-3, 4, -2, 5, -1, 6, 0, 7, 1, 8, 2, 9, 3, 10, 4, 11, 5, 12, 6, 13, 7, 14, 8, 15, 9, 16, 10, 17, 11, 18, 12
past 2
1, 1, 2, 3
a(n) = 3*2^n - 2
4, 10
only first
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5
double up
3.5, 7
to submit the answer replace the X with your guess.
this is not a puzzle.
no spaces and capitalization doesn't matter.