Modification should include using the ALTER SEQUENCE statement to change the increment, minimum and maximum values, cached numbers, and behavior of an existing sequence. The following syntax is required:
ALTER SEQUENCE <sequencename>
[INCREMENT BY n]
[START WITH s]
[MAXVALUE x / NOMAXVALUE]
[MINVALUE m / NOMINVALUE]
[CYCLE / NOCYCLE]
[CACHE c / NOCHACHE] [ORDER / NOORDER];
This statement affects only future sequence numbers used.