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1, 1, 4, 6, 18, 27, 82, 138, 390, 644, 1837, 3242, 8835, 15271, 42086, 76403, 203377, 361636, 974089, 1802727, 4718991, 8559441, 22673687, 42562209, 110006420, 202537249, 529643894, 1005279834, 2572145945, 4791823354
(list;
graph;
refs;
listen;
history;
text;
internal format)
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