Fill in the numbers 4,12,24,40, ()

Fill in the numbers 4,12,24,40, ()

4,12,24,40,( 60)
The rule is
4=1*4
12=3*4
24=6*4
40=10*4
The law of 1 3 6 10 is (square of N + n) / 2
So the whole rule is
(square of N + n) / 2 * 4 = 2 * (square of N + n)
It's the square of 2n + 2n