A 3x2 rectangle can be filled with 1x1 and 2x2 tiles in three ways:
Tilings of a 3x2 rectangle
The colors merely distinguish the sizes of the tiles. A 3x3 rectangle can be filled with 1x1 and 2x2 tiles in five ways:
Tilings of a 3x3 rectangle
Write a function to count the ways that a 3xn rectangle can be filled.
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Last Solution submitted on Jan 15, 2026

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George Berken Pauli Huusari Mehdi Dehghan Ankitkumar Ratan

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