a(n) = 11*a(n-1) + 2*a(n-2).

Terms

a(0) =0a(1) =1a(2) =11a(3) =123a(4) =1375a(5) =15371a(6) =171831a(7) =1920883a(8) =21473375a(9) =240048891a(10) =2683484551a(11) =29998427843a(12) =335349675375