Triangular array
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Generalizations
Triangular arrays may list mathematical values other than numbers; for instance the Bell polynomials form a triangular array in which each array entry is a polynomial.cite-ref-10[10]
Arrays in which the length of each row grows as a linear function of the row number (rather than being equal to the row number) have also been considered.cite-ref-11[11]
Applications
Romberg's method can be used to estimate the value of a definite integral by completing the values in a triangle of numbers.cite-ref-12[12]
The Boustrophedon transform uses a triangular array to transform one integer sequence into another.cite-ref-13[13]
In general, a triangular array is used to store any table indexed by two natural numbers where j ≤ i.
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