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  1. #include <stdio.h>
  2.  
  3. int a(int n)
  4. {
  5. 	if(n==0)
  6. 		return 0;
  7. 	else
  8. 		return a(n-1)*2+3;
  9. }
  10.  
  11. int main(void) {
  12.  
  13. 	int n;
  14. 	scanf("%d",&n);
  15. 	printf("%d",a(n));
  16.  
  17. 	return 0;
  18. }
  19.  
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/HdEnUC
language:
C (gcc 8.3)
created:
8 days ago
visibility:
public

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