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A115119
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Number of imprimitive (periodic) n-bead necklaces with beads of 2 colors when turning over is allowed.
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0
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0, 0, 2, 2, 3, 2, 5, 2, 6, 4, 9, 2, 16, 2, 19, 10, 30, 2, 55, 2, 81, 20, 127, 2, 248, 8, 381, 46, 690, 2, 1302, 2, 2250, 128, 4113
(list; graph; refs; listen; history; internal format)
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