Triangle read by rows: T(n,k) is the number of dissections of a convex n-gon by nonintersecting diagonals, having exactly k triangles (n >= 2, k >= 0).
A090985
Triangle read by rows: T(n,k) is the number of dissections of a convex n-gon by nonintersecting diagonals, having exactly k triangles (n >= 2, k >= 0).
Terms
- a(0) =1a(1) =0a(2) =1a(3) =1a(4) =0a(5) =2a(6) =1a(7) =5a(8) =0a(9) =5a(10) =4a(11) =6a(12) =21a(13) =0a(14) =14a(15) =8a(16) =35a(17) =28a(18) =84a(19) =0a(20) =42a(21) =25a(22) =80a(23) =216a(24) =120a(25) =330a(26) =0a(27) =132a(28) =64a(29) =309
External references
- oeis: A090985