数列:4,12,30,68,(
1个回答
A1=4
A2=A1*2+2*2=4*2+2*2=12
A3=A2*2+2*3=12*2+2*3=30
A4=A3*2+2*4=30*2+2*4=68
A5=A4*2+2*5=68*2+2*5=146
相关问题
★1,2,10,30,68,.(1)1,2,10,30,68,.(2)1,2,9,,625 (3)1,1,2,6,,12
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按规律填空:2.1 10.2 30.3 68.4 ()
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0 2 10 30 68 ()
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2,-6,12,-20,30,-42构成一个数列,求通项公式