Number of simple triangulations of the plane with n nodes.

Terms

a(0) =1a(1) =1a(2) =0a(3) =1a(4) =3a(5) =12a(6) =52a(7) =241a(8) =1173a(9) =5929a(10) =30880a(11) =164796a(12) =897380a(13) =4970296a(14) =27930828a(15) =158935761a(16) =914325657a(17) =5310702819a(18) =31110146416a(19) =183634501753