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1, 3, 8, 25, 72, 231, 696, 2268, 7030, 23155, 73188, 242957, 778946, 2601345, 8430992, 28289598, 92470194, 311472985, 1025114180, 3463982109, 11465054942, 38846071490, 129180293184, 438697998100, 1464716085664, 4984101484479, 16698145444260, 56918978668875
(list;
graph;
refs;
listen;
history;
text;
internal format)
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