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  ______   _    _     ____     _    _     _____   
 /_   _// | || | ||  |  _ \\  | || | ||  |__  //  
 `-| |,-  | || | ||  | |_| || | || | ||    / //   
   | ||   | \\_/ ||  | .  //  | \\_/ ||   / //__  
   |_||    \____//   |_|\_\\   \____//   /_____|| 
   `-`'     `---`    `-` --`    `---`    `-----`

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Text this: COUNTING LABELLED TREES