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The number of seats per row generate an arithmetic sequence. Let 
denote the number of seats in the 
-th row. We're told that the number of seats increases by 3 per row, so we can describe the number of seats in a given row recursively by
The total number of seats is given by the summation
Because is arithmetic, we can easily find an explicit rule for the sequence.
So the number of seats in the-th row is exactly
This means the total number of seats is
You should be familiar with the remaining sums. We end up with
The total number of seats is given by the summation
Because
So the number of seats in the
This means the total number of seats is
You should be familiar with the remaining sums. We end up with