Triangulations of the disk, G_{1,n}.

Terms

a(0) =1a(1) =2a(2) =5a(3) =16a(4) =48a(5) =164a(6) =559a(7) =1952a(8) =6872a(9) =24520a(10) =88006a(11) =318444a(12) =1158944a(13) =4241688a(14) =15598973a(15) =57620596a(16) =213680472a(17) =795270644a(18) =2969483214a(19) =11121038100a(20) =41763779054a(21) =157235683780a(22) =593355907790