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Print a size ascending range of Christmas trees using asterisks, ranging from size 3 to size 9, each tree separated by a blank line.

A size 3 tree should look like this, with a single centered asterisk for the trunk:

   *
  ***
 *****
   *

With the largest size 9 tree looking like this:

         *
        ***
       *****
      *******
     *********
    ***********
   *************
  ***************
 *****************
         *
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Top-level programs are supported, args holds ARGV.
ARGV is available via STDIN, joined on NULL. x is a no-op.
arguments holds ARGV, print() to output with a newline, write() to output without a newline.
say() is available without any import.
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.
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