Challenge 2: Painting tiles, no two black together

We have some tiles (in a row) and we need to paint them. We have 2 colors, yellow and black.

Rules:

1. You cannot place 2 black tiles together.
2. You can use any number of black or yellow tiles.

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Example: 3 tiles can be painted in the following 5 ways.
YYY, YBY, BYB, BYY, YYB

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Can you find how many ways are there to paint 5 tiles?