Simple triangulations of a disk: column 4 of square array in A210664.

Terms

a(0) =3a(1) =22a(2) =85a(3) =254a(4) =644a(5) =1448a(6) =2967a(7) =5645a(8) =10109a(9) =17214a(10) =28093a(11) =44212a(12) =67430a(13) =100064a(14) =144959a(15) =205563a(16) =286007a(17) =391190a(18) =526869a(19) =699754a(20) =917608a(21) =1189352a(22) =1525175a(23) =1936649a(24) =2436849a(25) =3040478a(26) =3763997a(27) =4625760a(28) =5646154a(29) =6847744