Least k such that n! divides C(2k,k).

Terms

a(0) =1a(1) =1a(2) =2a(3) =7a(4) =14a(5) =15a(6) =43a(7) =191a(8) =239a(9) =383a(10) =383a(11) =1919a(12) =1919a(13) =3967a(14) =4091a(15) =65471a(16) =65471a(17) =129023a(18) =129023a(19) =516095a(20) =516095a(21) =917503a(22) =1046527a(23) =8323071a(24) =8323071a(25) =16760831a(26) =16760831a(27) =113246207a(28) =113246207a(29) =367001599