Syntax options:

    MINVALUE numeric-value | NOMINVALUE

    The MINVALUE clause specifies the minimum signed quadword
    (BIGINT) value that the sequence can generate. The numeric
    value must be equal to or greater than -9223372036854775808. The
    MINVALUE must be less than or equal to the value specified with
    the START WITH clause and less than the value specified with the
    MAXVALUE clause. The NOMINVALUE clause specifies that the minimum
    value for an ascending sequence is 1, and -9223372036854775808
    (plus the cache size) for a descending sequence.

    The NOMINVALUE clause is the default.