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1, 2, 2, 4, 7, 12, 22, 77, 142, 532, 1881, 6680, 23965, 163600, 576849, 3866824, 26635009, 176366633, 1204710337, 15393505413, 104674234457, 1334666498849, 17456897665295, 221752333314343, 2885843552520634, 70795502834846238
(list;
graph;
refs;
listen;
history;
text;
internal format)
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