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1, 9, 45, 165, 495, 1287, 3003, 6435, 12870, 24309, 43749, 75537, 125805, 202995, 318483, 487311, 729036, 1068705, 1537965, 2176317, 3032523, 4166175, 5649435, 7568955, 10027986, 13148685, 17074629
(list; graph; refs; listen; history; internal format)
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