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0, 6, 24, 120, 480, 2002, 7952, 31824, 125760, 497420, 1960464, 7726160, 30418752, 119759850, 471424160, 1855967520, 7307828352, 28781143380, 113380093840, 446775310800, 1761038703424, 6943526580276, 27385654785504
(list; graph; refs; listen; history; internal format)
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