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3, 15, 73, 361, 1806, 9122, 46425, 237721, 1223365, 6321965, 32784830, 170528190, 889291352, 4648068192, 24342384337, 127707864849, 671047979300, 3531026714720, 18603737992455, 98129545962855, 518149580437560
(list; graph; refs; listen; history; internal format)
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