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

Terms

a(0) =1a(1) =2a(2) =7a(3) =11a(4) =26a(5) =40a(6) =81a(7) =111a(8) =196a(9) =254a(10) =429a(11) =515a(12) =790a(13) =944a(14) =1383a(15) =1599a(16) =2210a(17) =2548a(18) =3413a(19) =3851a(20) =5084a(21) =5588a(22) =7131a(23) =7841a(24) =9862a(25) =10672a(26) =13177a(27) =14179a(28) =17130a(29) =18448