Private Sub Worksheet_BeforeDoubleClick(ByVal Target As Range, Cancel As Boolean)
If Target.Address = "$A$15" Then
lnglz = ActiveSheet.Cells(Rows.Count, 1).End(xlUp).Row + 1
ActiveSheet.Cells(lnglz, 1).Value = ActiveSheet.Cells(lnglz - 1, 1).Value + 1
End If
ActiveSheet.Range("A16").Select
End Sub