a(n) = s(1)s(n) + s(2)s(n-1) + ... + s(k)s(n+1-k), where k = [ (n+1)/2 ], s = (composite numbers).

Terms

a(0) =16a(1) =24a(2) =68a(3) =84a(4) =158a(5) =180a(6) =289a(7) =330a(8) =474a(9) =534a(10) =735a(11) =810a(12) =1072a(13) =1158a(14) =1474a(15) =1586a(16) =1958a(17) =2093a(18) =2543a(19) =2697a(20) =3238a(21) =3403a(22) =4013a(23) =4208a(24) =4896a(25) =5128a(26) =5918a(27) =6164a(28) =7046a(29) =7337