Number of nonequivalent dissections of a polygon into n quadrilaterals by nonintersecting diagonals up to rotation.

A005034

Number of nonequivalent dissections of a polygon into n quadrilaterals by nonintersecting diagonals up to rotation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =7a(5) =25a(6) =108a(7) =492a(8) =2431a(9) =12371a(10) =65169a(11) =350792a(12) =1926372a(13) =10744924a(14) =60762760a(15) =347653944a(16) =2009690895a(17) =11723100775a(18) =68937782355a(19) =408323229930

External references