Exce VBA how to generate a row count in that starts with specific row and stops at last row? Formula is flawed - excel

Question

So I have what might be a simple issue. I have a worksheet where I'm just hoping to generate a row count starting with cell A4. So A4 = 1, A5 = 2 , etc. The problem is I'm not sure how to configure this with the following goal:
1 - I'm hoping the count starts with cell A4 and ends the count at the final row with data.
The code I have below only works if I manually put A4 = 1, and also populates formulas past the last row unfortunately.
Please help if this is possible.
Sub V14()
With ThisWorkbook.Worksheets("DCT")
.Cells(5, 1).Resize(.Cells(.Rows.Count, 2).End(xlUp).Row - 1).Formula = "=IF(DCT!B5="""","""",DCT!A4+1)"
End With
End Sub

Answer 1

Write Formula to Column Range
The Code
Sub V14()
Const wsName As String = "DCT" ' Worksheet Name
Const tgtRow As Long = 4 ' Target First Row Number
Const tgtCol As String = "A" ' Target Column String
Const critCol As String = "B" ' Criteria Column String
' Define worksheet ('ws').
Dim ws As Worksheet
Set ws = ThisWorkbook.Worksheets(wsName)
' Define Last Non-Empty Cell ('cel') in Criteria Column ('critCol').
Dim cel As Range
Set cel = ws.Cells(ws.Rows.Count, critCol).End(xlUp)
' Define Target Column Range ('rng').
Dim rng As Range
Set rng = ws.Cells(tgtRow, tgtCol).Resize(cel.Row - tgtRow + 1)
' Define Target Formula ('tgtFormula').
Dim tgtFormula As String
tgtFormula = "=IF('" & wsName & "'!" & critCol & tgtRow _
& "="""","""",MAX('" & wsName & "'!" & tgtCol _
& "$" & tgtRow - 1 & ":" & tgtCol & tgtRow - 1 & ")+1)"
' Write Target Formula to Target Range.
rng.Formula = tgtFormula
' If you just want to keep the values:
'rng.Value = rng.Value
End Sub

Answer 2

I think you might just need an extra IF:
Sub V14()
With ThisWorkbook.Worksheets("DCT")
.Cells(4, 1).Resize(.Cells(.Rows.Count, 2).End(xlUp).Row - 1).Formula = "=IF(DCT!B4="""","""",IF(A3="""",1,SUM(DCT!A3,1)))"
End With
End Sub
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Answer 3

Dim target As String
Dim lastrow As Long
target = "A4"
lastrow = ActiveSheet.UsedRange.Rows.count
'for example
Range(target) = "1"
Range(target).Offset(1, 0) = "2"
Range(Range(target),Range(target).Offset(1, 0)).Select
Selection.AutoFill Destination:=Range(target & ":A" & lastrow + Range(target).Row - 1), Type:=xlFillDefault
You only got to change the target cell, this does the rest.