Hi I need help making a recursive formula for an hour glass using the current row (crow) totalRows(trows)

if there are three rows it goes from 0,1,2

the shape of the hourglass if there are three rows would be

*** ****

suppose the top row goes through the midpoint, then, the rate of flow to the bottom is

(1/3)(1/3)(1/3)

=[(1/27)*total rows]/current raws

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