Answer
$a_1=1$
$a_2=1$
$a_3=2$
$a_4=2$
$a_5=3$
Work Step by Step
If $a_n=n-a_{n-1}$ and $a_1=1$, then
$a_2=2-a_1=2-1=1$
$a_3=3-a_2=3-1=2$
$a_4=4-a_3=4-2=2$
$a_5=5-a_4=5-2=3$
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