DB<99> ($x=4**$_)=~y/1-9/"/,printf"%22s%s\n",($x)x2for 1..20,0,0 "" """" """" """""" "0"""0"" "0"""0"" """""""""" """""""""" """""""""""" "0""""""0""""" """""0""""""0" """""""""""""""" """0"""""""0"""" """""""""""""""""" "0"""""""""0"""""""" """""""""""""""""""" """""""""""""""""""""" """""""""""""""""""""" """""""0"""""""""""0"""" "0""""""""""""0""""""""""" "" ""