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A056783
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Number of diamond polyominoes with n cells.
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4
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1, 1, 3, 7, 20, 62, 204, 709, 2526, 9212, 33989, 126838, 476597, 1802618, 6850969, 26153537, 100207548, 385225375, 1485216987, 5741272625, 22246000726, 86383442996, 336093551268, 1309998354125, 5114452295933, 19998173607505, 78306014924606, 307022185565345
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OFFSET
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1,3
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COMMENTS
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Also the number of polybricks of size n made of Lego.
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LINKS
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Eric Weisstein's World of Mathematics, Polyrhomb.
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FORMULA
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CROSSREFS
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KEYWORD
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nonn,hard
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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