Stirling numbers of the second kind

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Stirling numbers of the second kind

[¦stər·liŋ ‚nəm·bərz əvthə ′sek·ənd ‚kīnd]
(mathematics)
The numbers S (n, r) giving the numbers of ways that n elements can be distributed among r indistinguishable cells so that no cell remains empty.
References in periodicals archive ?
In particular, we determine the stirling number of the second kind [s.
Keywords Partitions, combinations, stirling number of the second kind.
The number of partitions of an n-elements set into r non-empty unordered subsets is called the stirling number of the second kind, and denoted by [S.
The stirling number of the second kind S2(n, r) can be taken from the formula (1)