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  1.  
  2. #include <stdio.h>
  3.  
  4. int tri(int n) {
  5.     if (n == 0) {
  6.         return 0;
  7.     } else if (n == 1) {
  8.         return 0;
  9.     } else if (n == 2) {
  10.         return 1;
  11.     } else {
  12.         return tri(n - 1) + tri(n - 2) + tri(n - 3);
  13.     }
  14. }
  15.  
  16. int main(void) {
  17.     int n = 6;
  18.     printf("T%d = %d\n", n, tri(n));
  19.     return 0;
  20. }
  21.  
Success #stdin #stdout 0.01s 5284KB
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stdin
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Standard input is empty
stdout
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T6 = 7
https://ideone.com/t2LyAk
language:
C (gcc 8.3)
created:
10 days ago
visibility:
public

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