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1, 5, 21, 85, 342, 1380, 5598, 22836, 93640, 385734, 1595232, 6619374, 27545269, 114901685, 480282369, 2011058681, 8433331523, 35410037683, 148842787215, 626234799703, 2636930617597, 11111302351505, 46848507630321, 197631791675365
(list; graph; refs; listen; history; internal format)
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