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1, 2, 6, 26, 91, 424, 1563, 7490, 28363, 138154, 532277, 2622108, 10229514, 50827494, 200236656, 1001864238, 3978724091, 20024629606, 80072228433, 405071776024, 1629554359654, 8281491341260, 33495987519034, 170937706521070, 694795683685757, 3559265886170942
(list;
graph;
refs;
listen;
history;
text;
internal format)
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