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1, 4, 14, 49, 177, 650, 2417, 9071, 34289, 130360, 497928, 1909322, 7345470, 28338826, 109597727, 424761659, 1649314553, 6414825656, 24986917292, 97458970094, 380589237038, 1487882440676, 5822592097682, 22806739654454
(list;
graph;
refs;
listen;
history;
text;
internal format)
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