If f(1)=1 and f(n)=f(n-1)

Question

if f(1)=1 and f(n) = f(n-1)² +1 then find the value of f(4)

Answer 1

f(2) = f(1)^2 + 1 = 1^1 + 1 = 1+1 = 2

f(3) = f(2)^2 + 1 = 2^2 + 1 = 4 + 1 = 5

f(4) = f(3)^2 + 1 = 5^2 + 1 = 25 + 1 = 26