Display the following triangle without using loop. Write a recursive function named triangle to solve the problem. Write a main function to test it. For example, given 6, your program displays the first 6 rows of the triangle.

1

1 2 1

1 2 3 2 1

1 2 3 4 3 2 1

1 2 3 4 5 4 3 2 1

1 2 3 4 5 6 5 4 3 2 1