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1, 2, 4, 16, 56, 424, 2979, 43547, 596720, 16903736, 450129276, 24740929636, 1274646618498, 135794808093563, 13566737103811527, 2802238029568573488, 542899687293133798346, 217420519981066905114215
(list;
graph;
refs;
listen;
history;
text;
internal format)
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