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  "body": "\n## Summary\n\nA **Riordan array** is an infinite lower triangular matrix, $D$, constructed from two [[formal power series|033WGN00BF]], $d(t)$ of order 0 and $h(t)$ of order 1, such that $d_{n,k} = [t^n]d(t) h(t)^k$.\n",
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