Calculate a vector of Bell numbers for sets up to length n. Bell numbers are the maximum number of partitions of a set. See the Wikipedia entry for Bell Number.
Belln(8) = [1 1 2 5 15 52 203 877 4140]
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Test for balanced parentheses
Get the area codes from a list of phone numbers
Matrix which contains the values of an other matrix A at the given locations.
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