Numbers n such that n!! - 2 is prime.

Terms

a(0) =5a(1) =7a(2) =15a(3) =17a(4) =19a(5) =51a(6) =73a(7) =89a(8) =131a(9) =153a(10) =245a(11) =333a(12) =441a(13) =463a(14) =825a(15) =1771a(16) =2027a(17) =9157a(18) =10875a(19) =20515