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Brachylog, (削除) 14 (削除ここまで) 11 bytes

;0{<≜.↔¬}i(

-3 bytes tanks to Fatalize

Explanation

; { }i( -- Find the nth number
 0 -- (starting with 0)
 < -- which is bigger then the previous one
 ≜ -- make explicit (otherwise it fucks up)
 . -- which is the output
 ↔ -- and if reversed
 ¬ -- is not the output

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