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现有一列数:6,24,60,120,210, 336,504……请仔细想一想,它们是按什么规则排列起来的?请写出这列数的第八个数。
The existing number of columns: 6,24,60,120,210, 336,504 ... Please think carefully, according to what rules are they arranged? Please write out the eighth of the number of columns.