Abstract
Like Fibonacci and Lucas numbers, Pell and Pell-Lucas numbers are a fertile ground for creativity and exploration. They also have interesting applications to combinatorics [1], especially to the study of lattice paths [2, 3], as we will see shortly.Pell numbers Pn and Pell-Lucas numbers Qn are often defined recursively [4, 5]:where n ≥ 3. They can also be defined by Binet-like formulas:
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