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1, 2, 4, 22, 100, 421, 1730, 7000, 28056, 111754, 443444, 1755310, 6937216, 27389041, 108067718, 426244160, 1680912060, 6628454969, 26139689490, 103095008914, 406671627876, 1604475043425, 6331612489122, 24991603082792
(list; graph; refs; listen; history; internal format)
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