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Recursionhard
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The Pell numbers satisfy the recurrence Pn=2Pn−1+Pn−2P_n = 2P_{n-1} + P_{n-2}Pn​=2Pn−1​+Pn−2​ with P0=0P_0 = 0P0​=0 and P1=1P_1 = 1P1​=1. What is P5P_5P5​?