The simplest approach is to import a record containing the value 11889.
Details:
Set AutoNumbers to start from ...
at: http://allenbrowne.com/ser-26.html
In Access 2000 and later, it is also possible to set the Seed of the
Autonumber field. Use the ADOX library to set the "Seed" property of the
Column in the Table in the Catalog.
You have been directed to the tricks, but keep in mind that auto numbers
are not consecutive numbers, it is designed to provide unique numbers.
Expecting it to keep number consecutive is likely to prove a disappointment.
There are other ways to do consecutive numbers that work.