Last week I made a post about Triangular Numbers. I posted a request for a new integer sequence on OEIS, which eventually got merged with an existing sequence, The Triangular Matchstick Numbers: https://oeis.org/A045943.

I love math.

Here are the Triangular Matchstick Number Formulas:

**Recurrence Relation:**

```
a(0) = 0
a(n) = a(n-1) + 3*n
```

**Generating Function:**

```
a(n) = 3*n
----------
(1-n)^3
```

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