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1, 8, 38, 141, 455, 1350, 3805, 10395, 27875, 73945, 194961, 512303, 1343768, 3521381, 9223435, 24152800, 63239810, 165572615, 433485350, 1134892290, 2971202146, 7778726798, 20364993198, 53316270346, 139583838315
(list;
graph;
refs;
listen;
history;
text;
internal format)
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