Number of solutions to p(n) = Sum_{i=1..n-1} c(i)*p(i) with c(i) in {-1,0,1} and p(n) = n-th prime.

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =1a(5) =5a(6) =11a(7) =28a(8) =69a(9) =164a(10) =437a(11) =1104a(12) =2887a(13) =7778a(14) =20861a(15) =55610a(16) =148857a(17) =408694a(18) =1112103a(19) =3059571a(20) =8519916a(21) =23586160a(22) =65766961a(23) =183122954a(24) =508287720a(25) =1423807763a(26) =4019399991a(27) =11359914488a(28) =32294035715a(29) =91866217942