a(n) = (4*n + 1)^8.A016820a(n) = (4*n + 1)^8.Terms a(0) =1a(1) =390625a(2) =43046721a(3) =815730721a(4) =6975757441a(5) =37822859361a(6) =152587890625a(7) =500246412961External referencesoeis: A016820