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             ___               _    _             
    ___     / _ \\      ___   | || | ||   ____    
   /   ||  | / \ ||    /   || | || | ||  |    \\  
  | [] ||  | \_/ ||   | [] || | \\_/ ||  | [] ||  
   \__ ||   \___//     \__ ||  \____//   |  __//  
    -|_||   `---`       -|_||   `---`    |_|`-`   
     `-`                 `-`             `-`

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Text this: COUNTING LABELLED TREES