a(n) = 3^n + 5^n + 6^n.

Terms

a(0) =3a(1) =14a(2) =70a(3) =368a(4) =2002a(5) =11144a(6) =63010a(7) =360248a(8) =2076802a(9) =12050504a(10) =70290850a(11) =411802328a(12) =2421454402a(13) =14282991464a(14) =84472462690a(15) =500716911608