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Question Number 50389 by Abdo msup. last updated on 16/Dec/18
$${find}\:{the}\:{sequence}\:{u}_{{n}} \:\:{wich}\:{verify}\: \\ $$$${u}_{{n}+\mathrm{2}} \:+\mathrm{4}{u}_{{n}+\mathrm{1}} −\mathrm{4}{u}_{{n}} ={n} \\ $$