a(n) = p(1)p(n) + p(2)p(n-1) + ... + p(k)p(n-k+1), where k = [ n/2 ], p = A000040, the primes.

Terms

a(0) =0a(1) =6a(2) =10a(3) =29a(4) =43a(5) =94a(6) =128a(7) =231a(8) =279a(9) =484a(10) =584a(11) =903a(12) =1051a(13) =1552a(14) =1796a(15) =2489a(16) =2823a(17) =3784a(18) =4172a(19) =5515a(20) =6091a(21) =7758a(22) =8404a(23) =10575a(24) =11395a(25) =14076a(26) =15174a(27) =18339a(28) =19667a(29) =23414