On the period of Pell-Narayana sequence in some groups

In this paper, the Pell-Narayana sequence modulo m is studied. The paper outlines the definition of Pell-Narayana numbers and some of their combinatorial links with Eulerian, Catalan and Delannoy numbers and other special functions. From the definition, the Pell-Narayana orbit of a 2-generator group for a generating pair $(x, y) \in G$ is defined, so that the lengths of the period of the Pell-Narayana orbit can be examined. These yield in turn the Pell-Narayana lengths of the polyhedral group and the binary polyhedral group for the generating pair $(x,y)$ and associated properties. Also, the period of the Pell-Narayana orbit of the groups $Q_8$, $Q_8 \times\mathbb{Z}_{2m}$ and $Q_8 \times_\phi \mathbb{Z}_{2m}$ for $m \geq 3$ were obtained.