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1, 1, 4, 10, 37, 121, 442, 1576, 5818, 21466, 80272, 301324, 1138762, 4320226, 16459132, 62904664, 241134553, 926678569, 3569385772, 13776307714, 53267766997, 206304355225, 800203300354, 3108008802064, 12086612436376, 47056902019336, 183400211694496
(list;
graph;
refs;
listen;
history;
text;
internal format)
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