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Combinatorial Functions
 
Factorial (!) factorial function (total arrangements of n objects)
Subfactorial number of derangements of n objects, leaving none unchanged
Factorial2 (!!) double factorial
    
Binomial binomial coefficients
Multinomial multinomial coefficients
CatalanNumber Catalan numbers
    
StirlingS1, StirlingS2 Stirling numbers
PartitionsP number of partitions of an integer
BellB Bell numbers
    
FrobeniusNumber Frobenius number for a list
    
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