how can you print this using C programing?

[nebrom]

how can you code to print the following output using C programing:

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

this is like a pyramid, it is narrow at the top and it becomes wide as it goes to the bottom.

and what about to print the reverse of the above:

1 2 3 4 5 4 3 2 1
1 2 3 4 3 2 1
1 2 3 2 1
1 2 1
1

thanks