title: Number Triangles N Moves 1
signature: function number_triangles_n_moves_1(n)
test_code: using Printf
  
  # SOLUTION CODE
  # ============================================
  PLACEHOLDER_CODE_BODY
  
  # TESTING CODE 
  # ============================================
  function validate_solution(actual, expected)
      return actual == expected
  end
  
  function driver(n, expected)
      try
  
          if validate_solution(PLACEHOLDER_FN_NAME(n), expected)
              return "PASSED";
          end
          return "FAILED";
      catch exception_obj
          return string(Base.typename(typeof(exception_obj)).wrapper);
      end
  end
  
  function main()
      
      result = driver(16, 86093441);
      @printf("TEST-0...%s\n",result);
      
  end
  
  main()
source_py: def number_triangles_n_moves_1(n):
      ans = ((2 * pow(3, n)) - 1)
      return ans
source_cpp: int number_triangles_n_moves_1(int n) {
    int ans = 2 * ( pow ( 3, n ) ) - 1;
    return ans;
  }