Numbers n such that n!! - 512 is prime.

Terms

a(0) =9a(1) =11a(2) =21a(3) =23a(4) =45a(5) =65a(6) =79a(7) =153a(8) =155a(9) =199a(10) =361a(11) =799a(12) =883a(13) =1237a(14) =1253a(15) =1753a(16) =4975a(17) =5117a(18) =5843a(19) =8179a(20) =12831