<|im_start|>system
You are a helpful assistant. You first think about the reasoning process in the mind and then provide the user with the answer. You should try to truely solve the question by yourself without cheating.  <|im_end|>
<|im_start|>user
 The following figures ⑴, ⑵, ⑶, ⑷ contain 1, 5, 13, 25 non-overlapping squares with side length 1, respectively. If the figures are constructed in the same manner, then the number of non-overlapping squares with side length 1 in the 20th figure is Show your work in <think> </think> tags. And return the final answer in <answer> </answer> tags.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>
user
761
The following figures ⑴, ⑵, ⑶, ⑷ contain 1, 5, 13, 25 non-overlapping squares with side length 1, respectively. If the figures are constructed in the same manner, then the number of non-overlapping squares with side length 1 in the 20th figure is
test