a(n) = 10*a(n-1) - a(n-2); a(0) = 1, a(1) = 5.

A001079

a(n) = 10*a(n-1) - a(n-2); a(0) = 1, a(1) = 5.

Terms

    a(0) =1a(1) =5a(2) =49a(3) =485a(4) =4801a(5) =47525a(6) =470449a(7) =4656965a(8) =46099201a(9) =456335045a(10) =4517251249a(11) =44716177445a(12) =442644523201

External references