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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