many thanks bernie for interest
examples:
For n = 2, matrix is:
1 1
1 2


For n = 3, matrix is:
1 1 1
1 1 2
1 2 1
1 2 2
1 2 3


For n = 4, matrix is:
1 1 1 1
1 1 1 2
1 1 2 1
1 1 2 2
1 1 2 3
1 2 1 1
1 2 1 2
1 2 1 3
1 2 2 1
1 2 2 2
1 2 2 3
1 2 3 1
1 2 3 2
1 2 3 3
1 2 3 4


For n = 5, matrix is :
1 1 1 1 1
1 1 1 1 2
1 1 1 2 1
1 1 1 2 2
1 1 1 2 3
1 1 2 1 1
1 1 2 1 2
1 1 2 1 3
1 1 2 2 1
1 1 2 2 2
1 1 2 2 3
1 1 2 3 1
1 1 2 3 2
1 1 2 3 3
1 1 2 3 4
1 2 1 1 1
1 2 1 1 2
1 2 1 1 3
1 2 1 2 1
1 2 1 2 2
1 2 1 2 3
1 2 1 3 1
1 2 1 3 2
1 2 1 3 3
1 2 1 3 4
1 2 2 1 1
1 2 2 1 2
1 2 2 1 3
1 2 2 2 1
1 2 2 2 2
1 2 2 2 3
1 2 2 3 1
1 2 2 3 2
1 2 2 3 3
1 2 2 3 4
1 2 3 1 1
1 2 3 1 2
1 2 3 1 3
1 2 3 1 4
1 2 3 2 1
1 2 3 2 2
1 2 3 2 3
1 2 3 2 4
1 2 3 3 1
1 2 3 3 2
1 2 3 3 3
1 2 3 3 4
1 2 3 4 1
1 2 3 4 2
1 2 3 4 3
1 2 3 4 4
1 2 3 4 5