Sequences are nice to use for auto-generating PK values for new
record inserts or, possibly, in your case for generating a "patient
number". Here again, though, this would be used for new record
inserts only. To see the current sequence value, use .CURVAL; to
obtain the next value, issue .NEXTVAL.
The view your displaying, I guess, is to display those records that
exist in the database. Consequently, the view does not access the
sequence but rather references the table column represented by
the "patient number".