Here is the completed integer sequence.

O  T  T  F   F  S  S  E   N  T  E

 

The sequence is obtained using the first letter of each number.

O for 1.

T for 2.

T for 3.

F for 4.

F for 5.

S for 6.

S for 7.

E for 8.

N for 9.

T for 10.

E for 11.

      

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