找规律3,6,12,20,30,42,(),()1,4,5,4,6,4,(),()2,3,4,5,8,7,(),()1,1,3,5,9,(),()

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找规律3,6,12,20,30,42,(),()1,4,5,4,6,4,(),()2,3,4,5,8,7,(),()1,1,3,5,9,(),()
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找规律3,6,12,20,30,42,(),()1,4,5,4,6,4,(),()2,3,4,5,8,7,(),()1,1,3,5,9,(),()
找规律3,6,12,20,30,42,(),()
1,4,5,4,6,4,(),()
2,3,4,5,8,7,(),()
1,1,3,5,9,(),()

找规律3,6,12,20,30,42,(),()1,4,5,4,6,4,(),()2,3,4,5,8,7,(),()1,1,3,5,9,(),()
3,6,12,20,30,42,(56),(72)
除了第一项不符合,后面应该通项为 n(n+1)
最后一列是1,1,3,5,9,(17),(31)
前面连续三项和等于接下来的第四项