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2, 4, 13, 52, 264, 1585, 11099, 88794, 799147, 7991477, 87906255, 1054875070, 13713375910, 191987262753, 2879808941305, 46076943060891, 783308032035156, 14099544576632824, 267891346956023663, 5357826939120473260
(list; graph; refs; listen; history; internal format)
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