The paper supplies combinatorial proofs of Tetranacci identities via square-and-domino tilings of hexagonal double-strips.
We find that the tile on cell 2k− 3 must be a square, because it cannot be a right-domino (no space)
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Tetranacci Identities With Squares, Dominoes, And Hexagonal Double-Strips
The paper supplies combinatorial proofs of Tetranacci identities via square-and-domino tilings of hexagonal double-strips.