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1, 2, 6, 20, 74, 290, 1196, 5102, 22418, 100762, 462184, 2155896, 10211440, 49013520, 238127606, 1169523872, 5801045062, 29033594556, 146509374164, 744892740620, 3813481756518, 19647505270704, 101820931159954, 530537879440540, 2778251007843926
(list;
graph;
refs;
listen;
history;
text;
internal format)
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