擅长:python、mysql、java
<pre><code>sequence=[1,2,3]
def find_value(n):
if n < 4:
return sequence[n-1]
else:
count=3
while count<n:
sequence.append(sequence[0]*sequence[1]-sequence[2])
sequence.pop(0)
count=count+1
return sequence[-1]
if __name__=="__main__":
n=int(input("Enter digit"))
print(find_value(n))
</code></pre>