Number of nonequivalent dissections of an n-gon into n-3 polygons by nonintersecting diagonals rooted at a cell up to rotation and reflection.

A003447

Number of nonequivalent dissections of an n-gon into n-3 polygons by nonintersecting diagonals rooted at a cell up to rotation and reflection.

Terms

    a(0) =1a(1) =2a(2) =7a(3) =26a(4) =108a(5) =434a(6) =1765a(7) =7086a(8) =28384a(9) =113092a(10) =449582a(11) =1783092a(12) =7062611a(13) =27944394a(14) =110494113a(15) =436699670a(16) =1725474562a(17) =6816591452a(18) =26927828642a(19) =106375090796a(20) =420248084468

External references