Number of nonequivalent dissections of an n-gon into n-3 polygons by nonintersecting diagonals up to rotation.

A220881

Number of nonequivalent dissections of an n-gon into n-3 polygons by nonintersecting diagonals up to rotation.

Terms

    a(0) =1a(1) =1a(2) =4a(3) =12a(4) =43a(5) =143a(6) =504a(7) =1768a(8) =6310a(9) =22610a(10) =81752a(11) =297160a(12) =1086601a(13) =3991995a(14) =14732720a(15) =54587280a(16) =202997670a(17) =757398510a(18) =2834510744a(19) =10637507400a(20) =40023636310a(21) =150946230006a(22) =570534578704

External references