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!
Project Euler: Problem 6, Natural numbers, squares and sums.
Find the hypotenuse
07 - Common functions and indexing 6
Is this triangle right-angled?
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