a(n) = 9^n - (1/2)*4^n, n > 0; a(0) = 0.

A386293

a(n) = 9^n - (1/2)*4^n, n > 0; a(0) = 0.

Terms

    a(0) =0a(1) =7a(2) =73a(3) =697a(4) =6433a(5) =58537a(6) =529393a(7) =4774777a(8) =43013953a(9) =387289417a(10) =3486260113a(11) =31378962457a(12) =282421147873

External references