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.
All your base are belong to us
Program an exclusive OR operation with logical operators
Replicate and Tile an Array
Integer to boolean
Simple return on investment
Cryptography with A Square Matrix : Encoding
Find two triangular numbers whose sum is input.
longest sequence of nans
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