---
tag: 3Q0QD7C059
kind: concept
name: Riordan array
aliases: [riordan-arrays, riordan-group]
sources:
  - wikipedia: en:38457493@r1349519158
    locator: Riordan array
    note: adopted
    mention: wikipedia://en/38457493
    sections: [Summary]
same_as:
  wikidata: Q7335421
  wikipedia: Riordan array
inventory: [RFXDWBBBBX]
---

## Summary

A **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 $d_{n,k} = [t^n]d(t) h(t)^k$.