# Project Euler/15

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**Project Euler Problem 15** is a problem related to the Pascal's triangle. The problem mentions a type of routes that starts from the top left and ends at the bottom right of the lattice, and can only move right or down. It requires you to count the number of such routes on a 20 by 20 lattice.

**Mathigon Dec 1 2021** is a similar problem that goes on a 4 by 4 lattice instead of 20 by 20. If you want to get the solution to that problem, try replacing `20`

with `4`

in the codes below.

*This article is a stub, which means that it is not detailed enough and needs to be expanded. Please help us by adding some more information.*

## Implementations

### Aheui

Works on Try it Online; Fails on AheuiChem.

밣발따발발나싹빠밤발따투망희 불떠벓벊서떠석토쎡뻐뻐처속 붆싹삭나사발발노 냐토다펴

## External resources

- Problem 15 on Project Euler Official Website (not available)
- Dec 1 2021 on Mathigon
- Problem 15 on Project Euler Mirror