Least number not dividing binomial(2n,n).

Terms

a(0) =3a(1) =4a(2) =3a(3) =3a(4) =5a(5) =5a(6) =5a(7) =4a(8) =3a(9) =3a(10) =5a(11) =3a(12) =3a(13) =7a(14) =7a(15) =4a(16) =7a(17) =8a(18) =9a(19) =8a(20) =7a(21) =7a(22) =7a(23) =7a(24) =5a(25) =5a(26) =3a(27) =3a(28) =9a(29) =3