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]
Achievement unlocked: Triple Arrayfun!
Find the longest sequence of 1's in a binary sequence.
Find common elements in matrix rows
Test for balanced parentheses
Divisible by 5
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