# Advent calendar 2020

## 13 December

There are 6 ways to split the sequence of the numbers 1 to 5 into three shorter sequences:

- 1 and 2 and 3, 4, 5
- 1 and 2, 3 and 4, 5
- 1 and 2, 3, 4 and 5
- 1, 2 and 3 and 4, 5
- 1, 2 and 3, 4 and 5
- 1, 2, 3 and 4 and 5

Today's number is the number of ways to split the sequence of the numbers 1 to 10 into five shorter sequences.