# Prove that this recurrence always submits a perfect square.

by Identicon   Last Updated August 03, 2018 04:20 AM

If $$a_{n+3}=-a_{n+2}+2a_{n+1}+8a_n$$ for $$a_1=a_2=a_3=1 \rightarrow$$ Then prove that the recurrence always submits a perfect square.

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