a(n) = 1^n + 4^n + 5^n.

Terms

a(0) =3a(1) =10a(2) =42a(3) =190a(4) =882a(5) =4150a(6) =19722a(7) =94510a(8) =456162a(9) =2215270a(10) =10814202a(11) =53022430a(12) =260917842a(13) =1287811990a(14) =6371951082a(15) =31591319950a(16) =156882857922a(17) =780119322310