Exponential convolution of primes with themselves (divided by 2).

Terms

a(0) =2a(1) =6a(2) =19a(3) =59a(4) =181a(5) =541a(6) =1583a(7) =4455a(8) =12213a(9) =32113a(10) =82631a(11) =206709a(12) =510681a(13) =1245343a(14) =3004575a(15) =7200705a(16) =17049021a(17) =40140981a(18) =93678375a(19) =216274577a(20) =496470625a(21) =1128356231a(22) =2544413119a(23) =5704402931a(24) =12712869673a(25) =28191681427a(26) =62282778949a(27) =137195275297a(28) =300840332783