See also Explain one liner for fibonacci.
Update: Explain Fibonacci one-liner ?? too.
Update 2010-07-21: Try this for Catalan numbers:
perl -le'$==0,(1x$_)=~/(^)(|1(?2)(?2)(?(?{})))$(?{$=++})^/,print$=for
+0..13'
Update 2010-11-21: A nicer version for the Catalan numbers:
perl -le'$==0,(1x$_)=~/^(|()1(?1)(?1)\2)$(?{$=++})^/,print$=for 0..13'
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