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Sierpiński Triangle

Details

The Sierpiński triangle is a fractal with the overall shape of an equilateral triangle, subdivided recursively into smaller equilateral triangles.

A Sierpiński triangle of order 4 should look like this, print such an output:

               ▲
              ▲ ▲
             ▲   ▲
            ▲ ▲ ▲ ▲
           ▲       ▲
          ▲ ▲     ▲ ▲
         ▲   ▲   ▲   ▲
        ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲
       ▲               ▲
      ▲ ▲             ▲ ▲
     ▲   ▲           ▲   ▲
    ▲ ▲ ▲ ▲         ▲ ▲ ▲ ▲
   ▲       ▲       ▲       ▲
  ▲ ▲     ▲ ▲     ▲ ▲     ▲ ▲
 ▲   ▲   ▲   ▲   ▲   ▲   ▲   ▲
▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲
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