2^n - Count_of_factors_of_2((2^n)!) ?
Count_of_factors_of_2 is a function which returns the highest positive integer power of 2 that can be divided evenly (i.e., with a remainder of 0) into its integer argument and otherwise the function returns 0.
n is a non-negative integer and is otherwise not specified.
The answer is 1.
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1 solution
2 n − i = 0 ∑ n − 1 2 i is 1 .