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1, 15, 160, 1600, 15856, 156976, 1553920, 15382240, 152268496, 1507302736, 14920758880, 147700286080, 1462082101936, 14473120733296, 143269125231040, 1418218131577120, 14038912190540176, 138970903773824656, 1375670125547706400, 13617730351703239360
(list; graph; refs; listen; history; internal format)
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