Number of subsets of {1..n} where no two elements sum to a prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =7a(5) =12a(6) =17a(7) =26a(8) =38a(9) =56a(10) =74a(11) =112a(12) =150a(13) =229a(14) =328a(15) =479a(16) =630a(17) =937a(18) =1278a(19) =1895a(20) =2610a(21) =3797a(22) =4984a(23) =7312a(24) =9640a(25) =14200a(26) =19068a(27) =27936a(28) =36982a(29) =54918