Number of nonequivalent dissections of an (n+2)-gon by nonintersecting diagonals up to rotation and reflection.

A001004

Number of nonequivalent dissections of an (n+2)-gon by nonintersecting diagonals up to rotation and reflection.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =3a(4) =9a(5) =20a(6) =75a(7) =262a(8) =1117a(9) =4783a(10) =21971a(11) =102249a(12) =489077a(13) =2370142a(14) =11654465a(15) =57916324a(16) =290693391a(17) =1471341341a(18) =7504177738a(19) =38532692207a(20) =199076194985

External references