Number of solutions to +-2 +- 3 +- 5 +- 7 +- ... +- prime(n) = 0 or 1.

Terms

a(0) =1a(1) =0a(2) =1a(3) =2a(4) =1a(5) =2a(6) =3a(7) =4a(8) =6a(9) =10a(10) =16a(11) =26a(12) =45a(13) =78a(14) =138a(15) =244a(16) =439a(17) =784a(18) =1417a(19) =2572a(20) =4698a(21) =8682a(22) =16021a(23) =29720a(24) =55146a(25) =102170a(26) =190274a(27) =356804a(28) =671224a(29) =1269022