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

Terms

a(0) =1a(1) =0a(2) =1a(3) =0a(4) =1a(5) =0a(6) =1a(7) =1a(8) =4a(9) =5a(10) =9a(11) =15a(12) =26a(13) =45a(14) =77a(15) =137a(16) =243a(17) =434a(18) =774a(19) =1408a(20) =2554a(21) =4667a(22) =8627a(23) =15927a(24) =29559a(25) =54867a(26) =101688a(27) =189425a(28) =355315a(29) =668598