7(18)
int main() {

  int sum = 0;
  for(int i=1; i<4; i++) {
    int v = 2*i-1;
    sum = sum + v;
    printf("%d %d\n", i, sum);
  }
  printf("Done\n");
  return 0;
}









sum  0 1 4 9
i 1 2 3 4
v 1 3 5
-----------------------
Screen
1 1
2 4
3 9
Done