The WAVE generator

Once upon a time there was a river. 'Sum' was passing by the river. He saw the water of the river that was so still and clear as crystal. He threw a stone into river. Then again he threw another stone of higher weight into the river.He saw there was two different kinds of waves were being generated due to the difference in weight of the stone.

For EXAMPLE: 'Sum' threw a stone of weight 6. The river generated wave as bellow.

     1     1     1     1     1     1
     1     2     2     2     2     2
     1     2     3     3     3     3
     1     2     3     4     4     4
     1     2     3     4     5     5
     1     2     3     4     5     6