a(n) = 3^n + 5^n + 8^n.

Terms

a(0) =3a(1) =16a(2) =98a(3) =664a(4) =4802a(5) =36136a(6) =278498a(7) =2177464a(8) =17174402a(9) =136190536a(10) =1083566498a(11) =8638939864a(12) =68964148802a(13) =550978111336