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1, 1, 2, 3, 8, 15, 30, 54, 138, 281, 562, 1069, 2700, 5682, 11364, 22196, 55756, 119437, 238874, 473871, 1186616, 2570259, 5140518, 10302254, 25745026, 56189736, 112379472, 226854572, 566088616, 1242353004, 2484706008
(list;
graph;
refs;
listen;
history;
text;
internal format)
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