Number of elements of GF(3^n) with trace 1 and subtrace 0.

Terms

a(0) =1a(1) =0a(2) =3a(3) =9a(4) =30a(5) =81a(6) =225a(7) =756a(8) =2187a(9) =6561a(10) =19602a(11) =59049a(12) =177633a(13) =530712a(14) =1594323a(15) =4782969a(16) =14351094a(17) =43046721a(18) =129127041a(19) =387440172a(20) =1162261467