Understanding DOLIST

[LGVE]

I was trying to understand DOLIST command with an example I found in the web:

{1 2 3}
{4 5 6}
{7 8 9}
3
<<+ *>>

Number 3 is the number of lists, as explained in the example.

The answer is {11 26 45}

I understand the calculator is doing this:
(7+4)*1=11
(8+5)*2+=26
(9+6)*3=45

But if I change 3 and put 2, the answer is:
{2145 4290 6435}

Can you explain what is the procedure the calculator is doing?

Thanks

Luis