Numbers k such that (2*k)!/(2*(k!)^2) - 1 is prime.

Terms

a(0) =2a(1) =6a(2) =10a(3) =21a(4) =45a(5) =63a(6) =306a(7) =404a(8) =437a(9) =471a(10) =646a(11) =1174a(12) =1192a(13) =1334a(14) =1975a(15) =2397a(16) =2410a(17) =4305a(18) =6111a(19) =7852a(20) =9488a(21) =11120a(22) =13304a(23) =14408a(24) =16075a(25) =16238a(26) =21188a(27) =21659a(28) =22025a(29) =28673