Distributing Numbers In A Pattern

I am trying to come up with a formula that will distribute the numbers as shown in this diagram:

To get the value of each number divide 42,000 by the last number in the pattern. For example the fifth column from the left would be 42,000/18. That means that each number would have a value of 2,333.33. By the time you reach the half way mark, nine in that example, you should have around 21,000, and the other 21,000 should be distributed between the last half (block 10 thru 18). The formulas would have to work on all of the patterns. Can anyone think of a way to match the pattern shown? It doesn't have to be exactly the same pattern just as long as the number of blocks remains the same for each half, and they total 21,000 for each half without going over 42,000 all together. There has to be 11 rows from top to bottom.