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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 2*a(n-1)+3;
  9.  
  10. }
  11.  
  12. int main(void) {
  13.  
  14. 	int n;
  15.  
  16. 	scanf("%d",&n);
  17.  
  18. 	printf("%d",a(n));
  19.  
  20. 	return 0;
  21. }
  22.  
Success #stdin #stdout 0.01s 5320KB
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https://ideone.com/Pjm2xA
language:
C99 (gcc 8.3)
created:
10 days ago
visibility:
public

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