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  1. #include <stdio.h>
  2.  
  3. int a(int n){
  4. if( n == 0 ){
  5. return 0;
  6. }
  7. else{
  8. return 2*a(n-1)+3;
  9. }
  10. }
  11.  
  12. int main(void) {
  13. int n=2,result;
  14. result=a(n);
  15. printf("%d\n",result);
  16.  
  17. }
  18.  
Success #stdin #stdout 0.01s 5288KB
stdin
Standard input is empty
stdout
9