def Fibo(n):
if n == 1 or n == 2:
return 1
else:
l = [1,1]
for i in range(2 , n):
l.append(l[i-1] + l[i-2])
return l[-1]
print Fibo(10)
def Ribo(n):
if n == 1:
return 6
else:
l = [6]
for i in range(1,n):
l.append( l[-1]**2 + 5)
return l[-1]
print Ribo(5)