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1, 3, 9, 27, 79, 231, 672, 1951, 5662, 16439, 47776, 139025, 405110, 1182107, 3454035, 10105373, 29600389, 86800887, 254797772, 748646741, 2201587214, 6479524339, 19084115993, 56246912653, 165882843095, 489509315203
(list;
graph;
refs;
listen;
history;
text;
internal format)
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