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2, 1, -1, 19, 149, 683, 2568, 8801, 28814, 92262, 292334, 921812, 2900518, 9118183, 28653193, 90026155, 282837225, 888573621, 2791553542, 8769944569, 27551617590, 86555987697, 271923687926, 854273498233, 2683779389671
(list;
graph;
refs;
listen;
history;
text;
internal format)
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