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A056317
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Number of primitive (aperiodic) reversible strings with n beads using a maximum of six different colors.
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3
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6, 15, 120, 645, 3990, 23295, 140610, 839790, 5042610, 30232965, 181421850, 1088390415, 6530486970, 39182081385, 235093327980, 1410554953080, 8463334761210, 50779978307010, 304679900238330
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