how many teams did the oilers play only once in the season?
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col : week | date | opponent | result | attendance row 1 : 1 | september 6, 1981 | at los angeles rams | w 27–20 | 63,198 row 2 : 2 | september 13, 1981 | at cleveland browns | w 9–3 | 79,483 row 3 : 3 | september 20, 1981 | miami dolphins | l 16–10 | 47,379 row 4 : 4 | september 27, 1981 | at new york jets | l 33–17 | 50,309 row 5 : 5 | october 4, 1981 | cincinnati bengals | w 17–10 | 44,350 row 6 : 6 | october 11, 1981 | seattle seahawks | w 35–17 | 42,671 row 7 : 7 | october 18, 1981 | at new england patriots | l 38–10 | 60,474 row 8 : 8 | october 26, 1981 | at pittsburgh steelers | l 26–13 | 52,732 row 9 : 9 | november 1, 1981 | at cincinnati bengals | l 34–21 | 54,736 row 10 : 10 | november 8, 1981 | oakland raiders | w 17–16 | 45,519 row 11 : 11 | november 15, 1981 | at kansas city chiefs | l 23–10 | 73,984 row 12 : 12 | november 22, 1981 | new orleans saints | l 27–24 | 49,581 row 13 : 13 | november 29, 1981 | atlanta falcons | l 31–27 | 40,201 row 14 : 14 | december 3, 1981 | cleveland browns | w 17–13 | 44,502 row 15 : 15 | december 13, 1981 | at san francisco 49ers | l 28–6 | 55,707 row 16 : 16 | december 20, 1981 | pittsburgh steelers | w 21–20 | 41,056
how many teams did the oilers play only once in the season?
Week Date Opponent Result Attendance
1 September 6, 1981 at Los Angeles Rams W 27–20 63,198
2 September 13, 1981 at Cleveland Browns W 9–3 79,483
3 September 20, 1981 Miami Dolphins L 16–10 47,379
4 September 27, 1981 at New York Jets L 33–17 50,309
5 October 4, 1981 Cincinnati Bengals W 17–10 44,350
6 October 11, 1981 Seattle Seahawks W 35–17 42,671
7 October 18, 1981 at New England Patriots L 38–10 60,474
8 October 26, 1981 at Pittsburgh Steelers L 26–13 52,732
9 November 1, 1981 at Cincinnati Bengals L 34–21 54,736
10 November 8, 1981 Oakland Raiders W 17–16 45,519
11 November 15, 1981 at Kansas City Chiefs L 23–10 73,984
12 November 22, 1981 New Orleans Saints L 27–24 49,581
13 November 29, 1981 Atlanta Falcons L 31–27 40,201
14 December 3, 1981 Cleveland Browns W 17–13 44,502
15 December 13, 1981 at San Francisco 49ers L 28–6 55,707
16 December 20, 1981 Pittsburgh Steelers W 21–20 41,056
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