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Option Explicit
Dim N As Integer
Private Sub Command1_Click()
    Dim A As Integer, B As Integer
    A = 2: B = 3
    For N = 1 To 6
      If N Mod 2 = 0 Then
          B = Fun(N, A) + A
      Else
          A = Fun(B, N) + B
      End If
    Next N
    Print N, A, B
End Sub
Private Function Fun(X As Integer, Y As Integer) As Integer
    X = Y - 1 + N
    Y = X + Y - N
    Fun = X + Y
End Function

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Private Function Fun(ByVal X As Integer, ByVal Y As Integer) As Integer
    X = Y - 1 + N
    Y = X + Y - N
    Fun = X + Y
End Function

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