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1, 1, 2, 15, 62, 180, 566, 2419, 9780, 34958, 125068, 491958, 1943862, 7377378, 27781250, 107932937, 422922350, 1637252968, 6306134498, 24545899232, 96073204466, 374915623580, 1459739914638, 5704537068510, 22360905044350
(list;
graph;
refs;
listen;
history;
text;
internal format)
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