Question 1108762
.
<pre>
{{{a[1]}}} = 1

{{{a[2]}}} = 0

{{{a[3]}}} = {{{a[2]}}} - {{{a[1]}}} = 0 - 1 = -1

{{{a[4]}}} = {{{a[3]}}} - {{{a[2]}}} = -1 - 0 = -1

{{{a[5]}}} = {{{a[4]}}} - {{{a[3]}}} = -1 - (-1) = -1 + 1 = 0.



The first 5 terms are  1,  0, -1, -1,  0.
</pre>