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0, 3, 36, 243, 1296, 6075, 26244, 107163, 419904, 1594323, 5904900, 21434787, 76527504, 269440587, 937461924, 3228504075, 11019960576, 37321507107, 125524238436, 419576389587, 1394713760400, 4613015762523, 15188432850756
(list; graph; refs; listen; history; internal format)
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