summation in datagridview

Question

I created a datagridview and
Added number of rows
from 1 to 7
summation to results
1
2
3
4
5
6
7
=> results
1
3
6
10
15
21
28
(1+2=3; 3+3=6; 6+4=10; 10+5=15; 15+6=21; 21+7=28)

write simple way

DataGridView1.RowCount = 9

For i As Integer = 1 To 7

DataGridView1.Rows(i).Cells(0).Value = i

Next

Dim kq1 As Integer = 0

Dim kq2 As Integer = 0

Dim kq3 As Integer = 0

Dim kq4 As Integer = 0

Dim kq5 As Integer = 0

Dim kq6 As Integer = 0

Dim kq7 As Integer = 0

Dim a As Integer = DataGridView1.Rows(0).Cells(0).Value

Dim b As Integer = DataGridView1.Rows(1).Cells(0).Value

Dim c As Integer = DataGridView1.Rows(2).Cells(0).Value

Dim d As Integer = DataGridView1.Rows(3).Cells(0).Value

Dim e1 As Integer = DataGridView1.Rows(4).Cells(0).Value

Dim f As Integer = DataGridView1.Rows(5).Cells(0).Value

Dim g As Integer = DataGridView1.Rows(6).Cells(0).Value

kq1 = a + b

kq2 = c + kq1

kq3 = d + kq2

kq4 = e1 + kq3

kq5 = f + kq4

kq6 = g + kq5

DataGridView1.Rows(0).Cells(0).Value = kq1

DataGridView1.Rows(1).Cells(0).Value = kq2

DataGridView1.Rows(2).Cells(0).Value = kq3

DataGridView1.Rows(3).Cells(0).Value = kq4

DataGridView1.Rows(4).Cells(0).Value = kq5

DataGridView1.Rows(5).Cells(0).Value = kq6

if adding new rows can't controlled
please help with all of the more compact form