Formula / sum / accumulate

I would like to sum the number.

Here is an example.
(value) (accumulate)

1. 10 10
2. 20 30
3. 8 38
4. 11 49
5. 3 52
   If Excel, it would be calculated as below (B line)
   sum($A$1:A*) * means same row number
   sum(B1,A2)

The summary bar will not be fine in my case.
I want to understand the accumulated total in each row.

Thanks for your support!