ELI5: Explain Like I'm 5

Fuss–Catalan number

Okay kiddo, so a fuss-catalan number is a number that tells you how many ways you can arrange things in a certain way. It's like when you are playing with blocks and you want to see how many different towers you can make with them.

Now, the "fuss" part is kind of like a special twist on the regular catalan number. It's named after a man named Fuss who came up with a variation of the original idea.

Let's say you have a row of blocks, and you can only stack them in certain ways. A fuss-catalan number tells you how many different ways you can stack them. It's like a secret code that tells you how to make all the possible stacks.

It might seem kind of complicated, but it's really just a fun way to play with math. It's like solving a puzzle or a mystery. And who knows, maybe one day you'll come up with your own version of a fuss-catalan number!