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.
Celsius to Kelvin
Find a Pythagorean triple
find the surface area of a cube
Vector to 3-Column Matrix
Low level NaN
Get Next Combination
Cryptography with A Square Matrix : Decoding
Van Eck's Sequence's nth member
Is there a GPU Device?
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