a(n) = 2^n + 3^n + 5^n.

Terms

a(0) =3a(1) =10a(2) =38a(3) =160a(4) =722a(5) =3400a(6) =16418a(7) =80440a(8) =397442a(9) =1973320a(10) =9825698a(11) =49007320a(12) =244676162a(13) =1222305640a(14) =6108314978a(15) =30531959800a(16) =152631002882a(17) =763068724360