# Number Of Bsts

medium

1. You are given a number n, representing the number of elements. 2. You are required to find the number of Binary Search Trees you can create using the elements.

## Constraints

0 <= n <= 15

## Format

### Input

A number n

### Output

A number representing the number of Binary Search Trees you can create using the elements.

## Example

Sample Input

4

### Sample Output

14

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