by Ricardo Fernández Serrata
Avoids the need for memoization and recursion/stack by replacing the entire code with expressions.
Because of this, non-integer input arguments are also supported. m will always be truncated but n won't (except if m > 3), which allows the output to be "interpolated" (extended to the full domain of real numbers)
Negative inputs are supported, but the results won't be "correct".
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