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{{distinguish|Triangular matrix}}
{{refimprove|date=August 2012}}
[[Image:BellNumberAnimated.gif|right|thumb|The triangular array whose right-hand diagonal sequence consists of [[Bell numbers]]]]
In mathematics and computing, a '''triangular array''' of numbers, polynomials, or the like, is a doubly indexed sequence in which each row is only as long as the row's own index.
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