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3, 30, 181, 874, 3711, 14524, 53736, 190782, 656350, 2202647, 7244772, 23436690, 74767864, 235710440, 735528909, 2274844294, 6980781346, 21273830001, 64432110648, 194066078164, 581597738908, 1735097817528, 5155001023066
(list; graph; refs; listen; history; internal format)
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