a(n) = L(n)*L(2n), where L(n) are the Lucas numbers (A000204).

A083564

a(n) = L(n)*L(2n), where L(n) are the Lucas numbers (A000204).

Terms

    a(0) =3a(1) =21a(2) =72a(3) =329a(4) =1353a(5) =5796a(6) =24447a(7) =103729a(8) =439128a(9) =1860621a(10) =7880997a(11) =33385604a(12) =141421803a(13) =599075421a(14) =2537719272a(15) =10749959329a(16) =45537545553a(17) =192900159396a(18) =817138154247

External references