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2, 2, 6, 34, 286, 3194, 44486, 742482, 14444046, 320918346, 8017473462, 222470403426, 6788415920190, 225916032873498, 8143297424571942, 316056720170045682, 13141075984919431662, 582736651766946778986
(list; graph; refs; listen; history; internal format)
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