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A067644
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Number of prime alternating tangles (or knots) of type Gamma_1 with two connected components.
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2
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1, 0, 2, 2, 6, 30, 62, 382, 1338, 6216, 29656, 131316, 669138, 3156172, 16032652, 80104192, 408448012, 2105616701
(list; graph; refs; listen; history; internal format)
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