The 6-polyiamond illustrated above.
Snake Polyiamond
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References
Golomb, S. W. Polyominoes: Puzzles, Patterns, Problems, and Packings, 2nd ed. Princeton, NJ: Princeton University Press, p. 92, 1994.Referenced on Wolfram|Alpha
Snake PolyiamondCite this as:
Weisstein, Eric W. "Snake Polyiamond." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/SnakePolyiamond.html