a(n) = 6*7^n - 5*6^n.

Terms

a(0) =1a(1) =12a(2) =114a(3) =978a(4) =7926a(5) =61962a(6) =472614a(7) =3541578a(8) =26190726a(9) =191733162a(10) =1392520614a(11) =10049975178a(12) =72163811526a(13) =516030592362