In American football, how many different ways can 21 points be scored in a football game, including safeties, touchdowns, field goals, and conversions? What are each of the possible ways?

I believe there are 23 different ways to score 21 points in a football game. They are:

1.) 8 8 3 2; 2.) 8 7 3 3; 3.) 8 7 2 2 2; 4.) 7 7 7; 5.) 8 7 6; 6.) 7 7 3 2 2; 7.) 8 6 3 2 2; 8.) 7 6 3 3 2;

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9.) 7 6 2 2 2 2; 10.) 6 6 3 3 3; 11.) 6 6 3 2 2 2; 12.) 8 3 3 3 2 2; 13.) 8 3 2 2 2 2 2; 14.) 7 3 3 3 3 2; 15.) 7 3 3 2 2 2 2; 16.) 7 2 2 2 2 2 2 2;

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17.) 6 3 3 3 3 3; 18.) 6 3 3 3 2 2 2; 19.) 6 3 2 2 2 2 2 2; 20.) 3 3 3 3 3 3 3; 21.) 3 3 3 3 3 2 2 2; 22.)3 3 3 2 2 2 2 2 2; 23.)3 2 2 2 2 2 2 2 2 2.

In college football, if a team is going for a conversion and the defending team takes possesion (by an interception, fumble, blocked kick) and returns the ball to the other end zone, the DEFENDING team gets 2 points. If you count this as different than the offensive team getting a 2 point conversion then you will have many more options.