...
   // Property accessors
   @SequenceGenerator(name = "generator", sequenceName = "tabbtid_id_seq")
   @Id
   @GeneratedValue(strategy = SEQUENCE, generator = "generator")
   @Column(name = "id", unique = true, nullable = false, insertable = true, updatable = true)
   public Integer getId() {
      return this.id;
   }
...

public @interface SequenceGenerator {
    java.lang.String name();

    java.lang.String sequenceName() default "";

    int initialValue() default 1;

    int allocationSize() default 50;
}

----------------

         //FIXME: work on initialValue() and allocationSize() through SequenceGenerator.PARAMETERS
         if ( seqGen.initialValue() != 0 ) {
            log.warn(
                  "Hibernate does not support SequenceGenerator.initialValue()"
            );
         }