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1, 3, 10, 36, 130, 476, 1769, 6630, 25017, 94961, 362181, 1386826, 5328341, 20531796, 79315343, 307077270, 1191203283, 4628896233, 18015359847, 70212552034, 273990076816, 1070416998344, 4186254302972, 16387566482916
(list; graph; refs; listen; history; internal format)
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