Number of diagonal dissections of an n-gon into 6 regions.

Terms

a(0) =0a(1) =132a(2) =1287a(3) =7007a(4) =28028a(5) =91728a(6) =259896a(7) =659736a(8) =1534896a(9) =3325608a(10) =6789783a(11) =13180167a(12) =24496472a(13) =43835792a(14) =75869640a(15) =127481640a(16) =208606320a(17) =333316620a(18) =521215695a(19) =799197399a(20) =1203649524a(21) =1783184480a(22) =2601993680a(23) =3743934480a(24) =5317472160a(25) =7461614160a(26) =10352989647