Numbers n such that n!!+2^n is prime.

Terms

a(0) =0a(1) =1a(2) =3a(3) =5a(4) =7a(5) =15a(6) =23a(7) =41a(8) =57a(9) =71a(10) =81a(11) =121a(12) =139a(13) =375a(14) =623a(15) =1143a(16) =2629a(17) =3011a(18) =3631a(19) =4895a(20) =5237a(21) =9569a(22) =10179a(23) =14179a(24) =16883a(25) =33129