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

Terms

a(0) =0a(1) =2a(2) =2a(3) =6a(4) =14a(5) =39a(6) =125a(7) =399a(8) =1310a(9) =4356a(10) =14970a(11) =51715a(12) =178832a(13) =635778a(14) =2290019a(15) =8106059a(16) =29234378a(17) =105635076a(18) =384409483a(19) =1408730050a(20) =5193316109a(21) =19170300330a(22) =71421970661a(23) =263893092145a(24) =984568438169