a(n) = 5*11^n+1.

Terms

a(0) =6a(1) =56a(2) =606a(3) =6656a(4) =73206a(5) =805256a(6) =8857806a(7) =97435856a(8) =1071794406a(9) =11789738456a(10) =129687123006