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1, 3, 12, 45, 180, 708, 2832, 11283, 45132, 180348, 721392, 2884860, 11539440, 46154928, 184619712, 738467565, 2953870260, 11815435908, 47261743632, 189046794180, 756187176720, 3024747985488, 12098991941952, 48395964882948
(list;
graph;
refs;
listen;
history;
text;
internal format)
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