2,4,48,108288
Try it out its pretty tough
First term =2
Second term =2^2 * (2 - 1) = 4
Third term =4^2 * (4 - 1) =48
Fourth term =48^2 * (48 - 1) =108,288
Fifth term =108,288^2 * (108,288 - 1) =1,269,804,867,452,928.......and so on.