A Riordan array is an infinite lower triangular matrix, D {\displaystyle D} , constructed from two formal power series, d ( t ) {\displaystyle d(t)} of order 0 and h ( t ) {\displaystyle h(t)} of order 1, such that d n , k = [ t n ] d ( t ) h ( t ) k {\displaystyle d_{n,k}=[t^{n}]d(t)h(t)^{k}} . A Riordan array is an element of the Riordan group.
A Riordan array is an infinite lower triangular matrix, D {\displaystyle D} , constructed from two formal power series, d ( t ) {\displaystyle d(t)} of order 0 and h ( t ) {\displaystyle h(t)} of order 1, such that d n , k = [ t n ] d ( t ) h ( t ) k {\displaystyle d_{n,k}=[t^{n}]d(t)h(t)^{k}} . A Riordan array is an element of the Riordan group.
Source: Wikipedia "Riordan array" · CC BY-SA 4.0
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