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  1. #include <stdio.h>
  2.  
  3. int a(int n)
  4. {
  5. 	int an,b=0,i;
  6. 	for(i=0;i<n;i++)
  7. 	{
  8. 		an=2*b+3;
  9. 		b=an;
  10. 	}
  11. 	return an;
  12. }
  13.  
  14. int main(void) {
  15.  
  16. 	int n;
  17. 	scanf("%d",&n);
  18. 	printf("%d",a(n));
  19.  
  20. 	return 0;
  21. }
  22.  
Success #stdin #stdout 0s 5324KB
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stdout
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https://ideone.com/TqygcO
language:
C (gcc 8.3)
created:
8 days ago
visibility:
public

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