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# Function catalan
The Catalan Numbers enumerate combinatorial structures of many different types.
catalan only takes integer arguments.
The following condition must be enforced: n >= 0
## Syntax
```js
math.catalan(n)
```
### Parameters
Parameter | Type | Description
--------- | ---- | -----------
`n` | Number | BigNumber | nth Catalan number
### Returns
Type | Description
---- | -----------
Number | BigNumber | Cn(n)
## Examples
```js
math.catalan(3) // returns 5
math.catalan(8) // returns 1430
```
## See also
[bellNumbers](bellNumbers.md)