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2, 29, 180, 873, 3710, 14523, 53735, 190781, 656349, 2202646, 7244771, 23436689, 74767863, 235710439, 735528908, 2274844293, 6980781345, 21273830000, 64432110647, 194066078163, 581597738907, 1735097817527, 5155001023065
(list; graph; refs; listen; history; internal format)
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