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1, 4, 13, 40, 119, 350, 1022, 2973, 8635, 25074, 72850, 211875, 616985, 1799092, 5253127, 15358500, 44958889, 131759776, 386557548, 1135204289, 3336791503, 9816315842, 28900431835, 85147344488, 251030187583, 740539502786
(list;
graph;
refs;
listen;
history;
text;
internal format)
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