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1, 2, 6, 27, 92, 440, 1556, 7514, 27082, 130883, 477258, 2303413, 8465592, 40783083, 150735628, 724837891, 2690363900, 12915186640, 48093650016, 230526280814, 860654319126, 4119854160332, 15413262342946, 73695109608352, 276180051478904, 1319136935150530, 4950605267226796
(list;
graph;
refs;
listen;
history;
text;
internal format)
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