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求数列通项求数列2,8,22,44,86,128,214,300,422,548,770,924,1238,...的通项an

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求数列通项
求数列2,8,22,44,86,128,214,300,422,548,770,924,1238,...的通项an

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an=2,8,22,44,86,128,214,300,422,548,770,924,1238,bn=a(n+1)-an=6,14,22,42,42,86,86,122,126,222,154,314,cn=b(n+1)-bn=8,8,20,0,44,0,36,4,96,-68,160,dn=c(n+1)-cn=0,12,-20,44,-44,36,-32,92,-164,228,en=d(n+...