function ackermann( m, n )
 if m == 0:  return( n + 1 )
 if n == 0:  return( ackermann( m - 1, 1 ) )
 return( ackermann( m - 1, ackermann( m, n - 1 ) ) )
end

for M in [ 0:4 ]
 for N in [ 0:7 ]
   >> ackermann( M, N ), " "
 end
 >
end