Riordan array

A Riordan array is an infinite lower triangular matrix, $D$ , constructed out of two formal power series, $d(t)$ and $h(t)$ , in such a way that $d_{n,k} = [t^n]d(t)\left(t h(t)\right)^k$ .

References

Sprugnoli, Renzo, An Introduction to Mathematical Methods in Combinatorics (PDF)

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