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Lah numbers: Difference between revisions
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Lah numbers are closely related to Stirling numbers of the first & second kinds, and may be derived from them.
Lah numbers obey
L(n, 0), L(0, k) = 0 # for n, k > 0
▲ L(n, k) = ( n! * (n - 1)! ) / ( k! * (k - 1)! ) / (n - k)! # For unsigned Lah numbers
''or''
;Task:
:* Write a routine (function, procedure, whatever) to find '''unsigned Lah numbers'''. There are several methods to generate unsigned Lah numbers. You are free to choose the most appropriate for your language. If your language has a built-in, or easily, publicly available library implementation, it is acceptable to use that.
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