Chapter 11 - 11.1 - Sequences and Series - 11.1 Exercises - Page 777: 16

$a_1=1$ $a_2=\frac{1}{4}$ $a_3=\frac{1}{9}$ $a_4=\frac{1}{16}$ $a_5=\frac{1}{25}$

$a_n=\frac{1}{n^2}$ $a_1=\frac{1}{1^2}=\frac{1}{1}=1$ $a_2=\frac{1}{2^2}=\frac{1}{4}$ $a_3=\frac{1}{3^2}=\frac{1}{9}$ $a_4=\frac{1}{4^2}=\frac{1}{16}$ $a_5=\frac{1}{5^2}=\frac{1}{25}$