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  1. #include <stdio.h>
  2.  
  3. int a(int n)
  4. {
  5.     int a0=0;
  6.     int a1,i;
  7.  
  8.     for(i=1;i<=n;i++)
  9.     {
  10.         a1=2*a0+3;
  11.         a0=a1;
  12.     }
  13.     return a1;
  14. }
  15.  
  16. int main(void) {
  17.  
  18.     int n;
  19.     scanf("%d",&n);
  20.  
  21.     printf("%d",a(n));
  22. 	return 0;
  23. }
  24.  
Success #stdin #stdout 0s 5316KB
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https://ideone.com/te0AkU
language:
C (gcc 8.3)
created:
8 days ago
visibility:
public

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