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Sierpiński Triangle

Details

The Sierpiński triangle is a fractal and attractive fixed set 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:

               ▲
              ▲ ▲
             ▲   ▲
            ▲ ▲ ▲ ▲
           ▲       ▲
          ▲ ▲     ▲ ▲
         ▲   ▲   ▲   ▲
        ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲
       ▲               ▲
      ▲ ▲             ▲ ▲
     ▲   ▲           ▲   ▲
    ▲ ▲ ▲ ▲         ▲ ▲ ▲ ▲
   ▲       ▲       ▲       ▲
  ▲ ▲     ▲ ▲     ▲ ▲     ▲ ▲
 ▲   ▲   ▲   ▲   ▲   ▲   ▲   ▲
▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲
All
Compiled from AT&T syntax to x86-64 Linux. Use syscalls to write output.
Top-level programs are supported, args holds ARGV.
ARGV is available via STDIN, joined on NULL. x is a no-op.
ARGV is available via STDIN, joined on NULL.
arguments holds ARGV, print() to output with a newline, write() to output without a newline.
say() is available without any import.
$args to access the arguments.
SELECT arg FROM argv to access the arguments, only the first column of the first result set will be printed, NULL values will be skipped, and the dialect is SQLite.
ctrl + enter or Run