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1, 2, 5, 16, 53, 186, 665, 2430, 8981, 33556, 126300, 478468, 1821677, 6965726, 26730639, 102895388, 397130997, 1536321264, 5955477230, 23128018490, 89962619148, 350442078972, 1366907765382, 5337995113404, 20868301796085
(list;
graph;
refs;
listen;
history;
text;
internal format)
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