MathalgebraSteve
posted by Nick .
The sequence {an} satisfies a0=1,a1=213, and an=2an−1+an−2 for all n≥2. Let
S=∑i=1 to infinity a[i1]/(a[i]^2a[i1]^2)
What is the value of 1/S?

148

148 is incorrect

424
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