Sequences And Series

Let V\(_r\) denote the sum of the first r terms of an arithmetic progression (A.P.) whose first term is r and the common difference is (\(2r-1\)). Let \({T_r} = {V_{r + 1}} - {V_r} - 2\) and \({Q_r} = {T_{r + 1}} - {T_r}\) for r = 1, 2, ...

The sum V\(_1\) + V\(_2\) + ... + V\(_n\) is