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1, 9, 45, 165, 495, 1287, 3003, 6435, 12870, 24309, 43758, 75573, 125970, 203445, 319770, 490149, 735471, 1081080, 1562274, 2218788, 3108105, 4289133, 5852925, 7882290, 10518255, 13871286, 18156204, 23511345, 30260340, 38564262, 48902997
(list; graph; refs; listen; history; internal format)
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