Just make it simple

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Let there be a sequence denoted by ak a_{k} for k0,kZ k \ge 0, k \in \mathbb{Z} . If:

a0=4a1=5a2=8a3=13 a_0=4 \\ a_1=5 \\ a_2=8 \\ a_3=13

Compute a20a18 |a_{20}-a_{18}|

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