a(n) = 12^n - 1.

A024140

a(n) = 12^n - 1.

Terms

    a(0) =0a(1) =11a(2) =143a(3) =1727a(4) =20735a(5) =248831a(6) =2985983a(7) =35831807a(8) =429981695a(9) =5159780351a(10) =61917364223a(11) =743008370687

External references