Sierpinski triangle on Console in Ruby

sierpinski-triangle.rb

ruby -le'64.times{|y|print" "*(63-y),(0..y).map{|x|~y&x>0?"  ":" A"}}'

stdout

                                A
                               A A
                              A   A
                             A A A A
                            A       A
                           A A     A A
                          A   A   A   A
                         A A A A A A A A
                        A               A
                       A A             A A
                      A   A           A   A
                     A A A A         A A A A
                    A       A       A       A
                   A A     A A     A A     A A
                  A   A   A   A   A   A   A   A
                 A A A A A A A A A A A A A A A A
                A                               A
               A A                             A A
              A   A                           A   A
             A A A A                         A A A A
            A       A                       A       A
           A A     A A                     A A     A A
          A   A   A   A                   A   A   A   A
         A A A A A A A A                 A A A A A A A A
        A               A               A               A
       A A             A A             A A             A A
      A   A           A   A           A   A           A   A
     A A A A         A A A A         A A A A         A A A A
    A       A       A       A       A       A       A       A
   A A     A A     A A     A A     A A     A A     A A     A A
  A   A   A   A   A   A   A   A   A   A   A   A   A   A   A   A
 A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A