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0, 0, 0, 0, 0, 1, 1, 7, 8, 36, 45, 165, 220, 715, 1001, 3003, 4368, 12376, 18564, 50388, 77520, 203490, 319770, 817190, 1307504, 3268760, 5311735, 13037895, 21474180, 51895935, 86493225, 206253075
(list; graph; refs; listen; history; internal format)
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