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1, 4, 14, 50, 180, 665, 2471, 9211, 34549, 130263, 494026, 1881856, 7192376, 27573423, 105995456, 408508079, 1577992336, 6107576116, 23681186995, 91967105404, 357684935577, 1393009597386, 5431756512184, 21203805984257
(list; graph; refs; listen; history; internal format)
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