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when toggle format what by license comment
Sep 6, 2010 at 15:32 history edited Emil CC BY-SA 2.5
edited body
Sep 6, 2010 at 15:17 comment added JBL Since Catalan numbers grow like $4^n$, your final estimate is too low (maybe should be $8^n$?), but I like the basic idea.
Sep 6, 2010 at 13:12 history answered Emil CC BY-SA 2.5