Question 1059602
{{{a[1]=-3}}}; {{{a[n]=a[n-1]*n^2}}}

Substitute n=2:

{{{a[n]}}}{{{""=""}}}{{{a[n-1]*n^2}}}
{{{a[2]=a[2-1]*2^2}}}
{{{a[2]=a[1]*4}}}
{{{a[2]=(-3)*4}}}
{{{a[2]=-12}}}
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Substitute n=3:

{{{a[n]}}}{{{""=""}}}{{{a[n-1]*n^2}}}
{{{a[3]=a[3-1]*3^2}}}
{{{a[3]=a[2]*9}}}
{{{a[3]=(-12)*9}}}
{{{a[3]=-108}}}
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Substitute n=4:

{{{a[n]}}}{{{""=""}}}{{{a[n-1]*n^2}}}
{{{a[4]=a[4-1]*4^2}}}
{{{a[4]=a[3]*16}}}
{{{a[4]=(-108)*16}}}
{{{a[4]=-1728}}}
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Substitute n=5:

{{{a[n]}}}{{{""=""}}}{{{a[n-1]*n^2}}}
{{{a[5]=a[5-1]*5^2}}}
{{{a[5]=a[4]*25}}}
{{{a[5]=(-1728)*25}}}
{{{a[5]=-43200}}}
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Edwin</pre>