Number of subsets of {1...n} containing all prime indices of the elements.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =7a(5) =9a(6) =15a(7) =22a(8) =43a(9) =79a(10) =127a(11) =175a(12) =343a(13) =511a(14) =851a(15) =1571a(16) =3141a(17) =4397a(18) =8765a(19) =13147a(20) =25243a(21) =46843a(22) =76795a(23) =115171a(24) =230299a(25) =454939a(26) =758203a(27) =1516363a(28) =2916079a(29) =4356079