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1, -1, 2, -5, 15, -52, 203, -877, 4140, -21147, 115975, -678570, 4213597, -27644437, 190899322, -1382958545, 10480142147, -82864869804, 682076806159, -5832742205057, 51724158235372, -474869816156751, 4506715738447323, -44152005855084346
(list;
graph;
refs;
listen;
history;
text;
internal format)
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