-n|-seq1|-sequence1 
This BRRECOVER command specifies the sequence number of the first redo log file for applying offline redo log files using the command option -t apply.
Syntax
-n|-seq1|-sequence1 <seq_nr>
Default value: none
Example
brrecover -seq1 18487
BRRECOVER recovers the database from the redo log file with the sequence number 18487.