There is a sequence and it is 2,8,18,32,50,72 what

The pattern for this sequence is that the difference between one number and the next is four more than the difference between that number and the previous one.
For example:
8 - 2 = 6
18 - 8 = 10
32 - 18 = 14
50 - 32 = 18

So the sequence is:
2, 8, 18, 32, 50, 72, 98, 128, 162, 200, 242, 288, 338, 392, 450, 512, 578, 648, 722, 800, 882, 968, 1058, 1152, 1250, 1352, 1458, 1568, 1682, 1800, 1922, 2048, 2178, 2312, 2450, 2592, 2738, 2888, 3042, 3200, 3362, 3528, 3698, 3872, 4050, 4232, 4418, 4608, 4802, 5000, ...

So the 50th number in the sequence is 5000