Answer:
squares of the reciprocals of natural numbers
Step-by-step explanation:
The numbers are squares of the reciprocals of successive natural numbers.
1 : (1/1)^2 = 1
2 : (1/2)^2 = 1/4
3 : (1/3)^2 = 1/9
4 : (1/4)^2 = 1/16
5 : (1/5)^2 = 1/25
