a(n) = ((4+sqrt(3))*(8+2*sqrt(3))^n-(4-sqrt(3))*(8-2*sqrt(3))^n)/(2*sqrt(3)).

A161729

a(n) = ((4+sqrt(3))*(8+2*sqrt(3))^n-(4-sqrt(3))*(8-2*sqrt(3))^n)/(2*sqrt(3)).

Terms

    a(0) =1a(1) =16a(2) =204a(3) =2432a(4) =28304a(5) =326400a(6) =3750592a(7) =43036672a(8) =493555968a(9) =5658988544a(10) =64878906368a(11) =743795097600

External references