如图,∠MON=30°,点A1在射线OM上,过点A1作A1B1⊥OM交射线ON于点B1,将△A1OB1沿A1B1折叠得到△A1A2B1,点A2落在射线OM上;过点A2作A2B2⊥OM交射线ON于点B2,将△A2OB2沿A2B2折叠得到△A2A3B2,点A2落在射线OM上;…按此作法进行下去,在∠MON内部作射线OH,分别与A1B1,A2B2,A3B3,…,AnBn交于点P1,P2,P3,…Pn,又分别与A2B1,A3B2,A4B3,…,An+1Bn,交于点Q1,Q2,Q3,…,Qn.若点P1为线段A1B1的中点,OA1=√3,则四边形AnPnQnAn+1的面积为___________________(用含有n的式子表示).

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