Re,
Sub InsérerTr()
Dim tr(1), i%, i0%, n%, r%
n = 20 'Nombre d'insertions
tr(0) = "</tr> <tr>"
tr(1) = "</tr><tr> <!--3-->"
r = 3: i0 = -1
Application.ScreenUpdating = False
With ActiveSheet
For i = 1 To n
.Cells(i * 6 + i0, 1) = tr(i Mod 2)
If i Mod 2 = 0 Then
tr(1) = Replace(tr(1), r, r + 1): r = r + 1
End If
Next i
End With
End Sub
Cordialement.