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1, 2, 5, 15, 51, 192, 781, 3416, 15925, 78596, 408338, 2224366, 12650993, 74876951, 459783612, 2922921342, 19192162341, 129864598567, 903840021982, 6460209847134, 47345351199235, 355305371430876, 2727065598788861
(list; graph; refs; listen; history; internal format)
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