def s(n):
return(10*4^n*(3+(-1)^n))
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s_list=[s(i) for i in srange(20) ]
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list_plot(s_list,plotjoined=True)
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s_ratio_list =[s(i+1)/s(i) for i in srange(20) ]
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list_plot(s_ratio_list,plotjoined=True)
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s_log_list=[log(s(i)) for i in srange(20) ]
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A=list_plot(s_log_list,plotjoined=True)
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B=list_plot(s_log_list,plotjoined=True, color='red')
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show(A+B)
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