Let \(\{a_1,a_2,a_3,a_4,a_5\ldots a_n\}\) be a sequence such that \(a_1=2\) and \(a_n-a_{n-1}=2n\) for all \(n>1\).

Then let \(Z=a_1+a_2+a_3+\ldots a_{20}\) .

What is the sum of digits of \(Z\)?

**Note**:

- For no confusion, the sum of the digits in 99929 is 38. The sum of the digits in 1000 is 1.

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