a(n) = s(1)s(n) + s(2)s(n-1) + ... + s(k)s(n-k+1), where k = [ n/2 ], s = (F(2), F(3), F(4), ...).

A025105

a(n) = s(1)s(n) + s(2)s(n-1) + ... + s(k)s(n-k+1), where k = [ n/2 ], s = (F(2), F(3), F(4), ...).

Terms

    a(0) =2a(1) =3a(2) =11a(3) =18a(4) =44a(5) =71a(6) =155a(7) =251a(8) =510a(9) =825a(10) =1608a(11) =2602a(12) =4924a(13) =7967a(14) =14761a(15) =23884a(16) =43540a(17) =70449a(18) =126805a(19) =205175a(20) =365532a(21) =591443a(22) =1044816a(23) =1690548a(24) =2965334a(25) =4798011a(26) =8365415

External references