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1, 4, 16, 320, 4430, 40872, 463106, 5675188, 63422950, 710698093, 8200538232, 93691594514, 1063586983374, 12137123569004, 138570852491100, 1579149122960061, 18003479738145524, 205351456145093852, 2341614891431192875, 26699543185422994944, 304468247045695911612
(list;
graph;
refs;
listen;
history;
text;
internal format)
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