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0, 0, 1, 1, 2, 4, 9, 20, 47, 112, 273, 676, 1694, 4296, 10991, 28350, 73614, 192327, 505093, 1332801, 3531598, 9393501, 25070735, 67121670, 180216260, 485133376, 1309101329, 3540394176, 9594562328, 26051397890, 70861839620
(list; graph; refs; listen; history; internal format)
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