Vinod's right - the notion is to leave the Oracle sequence name untouched (in general, we want to leave the Oracle datamodel untouched except for bug fixes and enhancements). Give the Postgres view the same name.
As everyone knows, I'm a bear for consistency and due to length considerations, _seq is preferable to _sequence in Oracle names. But, I'm not so anal about consistency that I'll ask all porters to weed out names in existing Oracle datamodel code inherited from aD. If you want to, sure, do so, though!