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1, 3, 6, 12, 26, 62, 157, 409, 1079, 2863, 7617, 20299, 54202, 145134, 390048, 1052840, 2855633, 7784909, 21333806, 58769738, 162735221, 452890963, 1266501060, 3558037366, 10038873751, 28437746721, 80854303650, 230659891380
(list;
graph;
refs;
listen;
history;
text;
internal format)
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