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

A024469

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

Terms

    a(0) =1a(1) =3a(2) =13a(3) =19a(4) =48a(5) =79a(6) =176a(7) =283a(8) =580a(9) =940a(10) =1844a(11) =2982a(12) =5667a(13) =9171a(14) =17047a(15) =27581a(16) =50404a(17) =81557a(18) =147090a(19) =237995a(20) =424686a(21) =687158a(22) =1215528a(23) =1966764a(24) =3453733a(25) =5588259a(26) =9752641

External references