a(n) = 7*(10^n - 9).

A175601

a(n) = 7*(10^n - 9).

Terms

    a(0) =7a(1) =637a(2) =6937a(3) =69937a(4) =699937a(5) =6999937a(6) =69999937a(7) =699999937a(8) =6999999937a(9) =69999999937a(10) =699999999937

External references