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A061207
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Number of subgroups of index n of the braid group on 3 strands <a,b|aba=bab>= <c,d|c^2=d^3>, the fundamental group of the complement of a trefoil knot.
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0
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1, 1, 4, 9, 6, 22, 43, 49, 130, 266, 287, 786, 1730, 2199, 5184, 12193, 17035, 37786, 88959, 136814, 288292, 682573, 1118997, 2307154, 5428806, 9409518
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