Smallest number of crossing-free matchings on n points in the plane.

Terms

a(0) =1a(1) =1a(2) =3a(3) =2a(4) =10a(5) =5a(6) =35a(7) =14a(8) =126a(9) =42a(10) =462a(11) =132a(12) =1716a(13) =429a(14) =6435a(15) =1430a(16) =24310a(17) =4862a(18) =92378a(19) =16796a(20) =352716a(21) =58786a(22) =1352078a(23) =208012a(24) =5200300a(25) =742900a(26) =20058300a(27) =2674440a(28) =77558760a(29) =9694845