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1, 5, 19, 72, 268, 1005, 3799, 14350, 54444, 207135, 790949, 3031433, 11646994, 44857634, 173127114, 669509099, 2594004566, 10066946714, 39126828963, 152278248462, 593391659312, 2314989154878, 9041050018706
(list; graph; refs; listen; history; internal format)
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