/LM 100 def % left margine
/UM 700 def % upper margine
/FS 18 def % font size

/showNum {
	% define a procedure to show a number
} def


/factorial{
	% define a procedure to calculate n!
} def

/newLine {
	% define a procedure to start a new line
} def

/catalan {
	% the main procedure
} def


%Usage: n catalan
LM UM moveto
17 catalan