What is the A(1) term?

What is the A(1) term?

a1=1 and an= (an-1)2 + 1

If a1=1 and an=(an-1)^2 + 1.

Please can anyone solve this realy hard sequence problem?

an = ?

Find the value of a (sub 4) - a (sub 3). I am expected to show my work.

there are choices, but i do not know how to get an answer without doing all the previous 19 terms...is there a formula to use? 1)80 2)91 3)95 4)101

an = ?

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