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That's simply the nth bell number for a n element set, you can search on the internet about how to find nth bell number , basically its the number of disjoint partitions of the set, within each partition , all elements are related to each other, satisfying the three properties.
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thatps the nth bell number for n element set, thats actually the number of disjoint partitions of a given set, within each partition , all elements are related to each other satisfying the three required properties. you can search for finding nth bell number on the internet.
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It is equal to nth Bell number given n elements Set