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1, 1, 3, 12, 46, 172, 651, 2478, 9457, 36228, 139249, 536687, 2073540, 8028826, 31147792, 121045410, 471128566, 1836259944, 7165975248, 27997121205, 109497724812, 428659516902, 1679585156639, 6586339566777, 25847132064141
(list;
graph;
refs;
listen;
history;
text;
internal format)
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