May I ask the rule of 1.2.4.7.11. (). (). What number should be filled in brackets?

May I ask the rule of 1.2.4.7.11. (). (). What number should be filled in brackets?

The second number is 1 more than the first number, the third number is 2 more than the second number, and the fourth number is 3 more than the third number And so on, should fill in 16, 22, 29