#include <stdio.h>
int tri(int n){
if(n == 0) {
return 0;
}
else if(n == 1){
return 0;
}
else if(n == 2) {
return 1;
}
return tri(n-1) + tri(n-2) + tri(n-3);
}
int main(void) {
int n = 7;
printf("数列Tnについて, n=%dのときの値は%d\n", n
, tri
(n
)); return 0;
}
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