Number of subsets of {2..n} such that the product of the elements plus 1 is a prime.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =5a(5) =9a(6) =18a(7) =32a(8) =56a(9) =111a(10) =211a(11) =386a(12) =727a(13) =1374a(14) =2654a(15) =5018a(16) =9346a(17) =17946a(18) =33654a(19) =63754a(20) =120619a(21) =229835a(22) =443058a(23) =834608a(24) =1563645a(25) =2999088a(26) =5843122a(27) =11070802a(28) =21253933a(29) =41347141