Gets or sets the number that starts a given sequence of a numbered list.
When the numbering is alphabetical, the number should map to the appropriate letter. For instance 1 maps to 'a', 2 to 'b' and so on. If the numbers are larger than 26, then multiple letters should be used. For instance 27 should be represented as 'aa' and similarly 53 should be 'aaa'.
|ArgumentOutOfRangeException||Value is not between 1 and 32767 (inclusive).|