Number of solutions to 3 +- 7 +- 13 +- 19 +- ... +- prime(4*n) = 0.

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =2a(5) =8a(6) =27a(7) =83a(8) =292a(9) =944a(10) =3279a(11) =11291a(12) =38992a(13) =138066a(14) =490248a(15) =1757360a(16) =6347321a(17) =22998089a(18) =83780199a(19) =306819363a(20) =1128999790a(21) =4174251748a(22) =15507225620a(23) =57767819903a(24) =215327188611a(25) =803901214851