Riordan array
A Riordan array is an infinite lower triangular matrix, , constructed out of two formal power series, and , in such a way that .
References
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A Riordan array is an infinite lower triangular matrix, 
![{\displaystyle d_{n,k}=[t^{n}]d(t)\left(th(t)\right)^{k}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/cd681e2b660a7fa36404843aaffeae482605650d)
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