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{{Distinguish|Triangular matrix}}
[[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. In other words, the element {{mvar|a<sub>ij</sub>}} at row {{mvar|i}} and column {{mvar|j}} only exists if {{math|''i'' ≥ ''j''}}.
==Examples==
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