Return double factorial
n(n-2)...(5)(3)(1), n>0, odd
n!! = n(n-2)...(6)(4)(2), n>0, even
1 , n = -1, or n = 0
6!! = (6)(4)(2) = 48
Neither n = -1, nor n = 0 are tested.
Determine whether a vector is monotonically increasing
Square a Number
Summation of array
I Plead the Fifth
Challenging perms function!
Find two triangular numbers whose sum is input.
unique with nan
Lunar Arithmetic (Addition)
Basic Monte Carlo Simulation
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