Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Week | Date | Opponent | Result | Record | Game Site | Attendance |
| --- | --- | --- | --- | --- | --- | --- |
| 1.0 | August 31, 1997 | at Miami Dolphins | L 10–16 | 0–1 | Pro Player Stadium | 70,813 |
| 2.0 | September 7, 1997 | New England Patriots | L 6–31 | 0–2 | RCA Dome | 53,632 |
| 3.0 | September 14, 1997 | Seattle Seahawks | L 3–31 | 0–3 | RCA Dome | 49,194 |
| 4.0 | September 21, 1997 | at Buffalo Bills | L 35–37 | 0–4 | Rich Stadium | 55,340 |
| 5.0 | Bye | Bye | Bye | Bye | Bye | Bye |
| 6.0 | October 5, 1997 | New York Jets | L 12–16 | 0–5 | RCA Dome | 48,295 |
| 7.0 | October 12, 1997 | at Pittsburgh Steelers | L 22–24 | 0–6 | Three Rivers Stadium | 57,925 |
| 8.0 | October 20, 1997 | Buffalo Bills | L 6–9 | 0–7 | RCA Dome | 61,139 |
| 9.0 | October 26, 1997 | at San Diego Chargers | L 19–35 | 0–8 | Jack Murphy Stadium | 63,177 |
| 10.0 | November 2, 1997 | Tampa Bay Buccaneers | L 28–31 | 0–9 | RCA Dome | 58,512 |
| 11.0 | November 9, 1997 | Cincinnati Bengals | L 13–28 | 0–10 | RCA Dome | 58,473 |
| 12.0 | November 16, 1997 | Green Bay Packers | W 41–38 | 1–10 | RCA Dome | 60,928 |
| 13.0 | November 23, 1997 | at Detroit Lions | L 10–32 | 1–11 | Pontiac Silverdome | 62,803 |
| 14.0 | November 30, 1997 | at New England Patriots | L 17–20 | 1–12 | Foxboro Stadium | 58,507 |
| 15.0 | December 7, 1997 | at New York Jets | W 22–14 | 2–12 | The Meadowlands | 61,168 |
| 16.0 | December 14, 1997 | Miami Dolphins | W 41–0 | 3–12 | RCA Dome | 61,282 |
| 17.0 | December 21, 1997 | at Minnesota Vikings | L 28–39 | 3–13 | Metrodome | 54,107 |
Question:
Attendance of 55,340 had what opponent?
Answer:
at Buffalo Bills