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2, 4, 12, 48, 243, 1458, 10209, 81673, 735061, 7350617, 80856796, 970281553, 12613660194, 176591242722, 2648868640839, 42381898253439, 720492270308475, 12968860865552555, 246408356445498551, 4928167128909971020
(list; graph; refs; listen; history; internal format)
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