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

Terms

a(0) =2a(1) =3a(2) =11a(3) =17a(4) =40a(5) =56a(6) =111a(7) =147a(8) =254a(9) =308a(10) =515a(11) =621a(12) =944a(13) =1094a(14) =1599a(15) =1849a(16) =2548a(17) =2884a(18) =3851a(19) =4243a(20) =5588a(21) =6170a(22) =7841a(23) =8493a(24) =10672a(25) =11496a(26) =14179a(27) =15281a(28) =18448a(29) =19780