Number of dissections of a convex (n+2)-gon into triangles and quadrilaterals by nonintersecting diagonals.

A001002

Number of dissections of a convex (n+2)-gon into triangles and quadrilaterals by nonintersecting diagonals.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =10a(4) =38a(5) =154a(6) =654a(7) =2871a(8) =12925a(9) =59345a(10) =276835a(11) =1308320a(12) =6250832a(13) =30142360a(14) =146510216a(15) =717061938a(16) =3530808798a(17) =17478955570a(18) =86941210950a(19) =434299921440

External references