Question 475304
Well set up a table to relate n to An, when An refers to the nth term of the sequence.
n =  1,  2,   3,   4,   5  ... n
An = 1, 1/4, 1/9, 1/16, 1/25 ... ?
Now try to establish a pattern.
{{{1/4 = 1/2^2 = 1/n^2}}}
{{{1/9 = 1/3^2 = 1/n^2}}}
{{{1/16 = 1/4^2 = 1/n^2}}}
{{{1/25 = 1/5^2 = 1/n^2}}}
Notice how the relationship remains constant for each n.
Therefore, {{{An = 1/n^2}}}