Numbers k such that k!! - 1 is prime.

Terms

a(0) =3a(1) =4a(2) =6a(3) =8a(4) =16a(5) =26a(6) =64a(7) =82a(8) =90a(9) =118a(10) =194a(11) =214a(12) =728a(13) =842a(14) =888a(15) =2328a(16) =3326a(17) =6404a(18) =8670a(19) =9682a(20) =27056a(21) =44318a(22) =76190a(23) =100654a(24) =145706