Creating a Sequence 
You can use SQL Studio to create new sequences in the database.
You have the necessary user authorizations and have user attribute NOT EXCLUSIVE*.
...
Choose Catalog Manager ® New ® Sequence.
Enter a name for the sequence, and define the required values.
Choose Sequence Definition ® Create Sequence.

To export the SQL statement for creating the sequence to the SQL dialog, choose Sequence Definition ® Export to SQL Dialog.
*For an explanation
of user authorizations and user attributes, see the
User Concept
section of the documentation The SAP DB Database System and the
Authorization
section of the Reference Manual: SAP DB.
For information on
the syntax of CREATE SEQUENCE statements, see the
CREATE SEQUENCE
Statement section of the Reference Manual: SAP DB.