a(n) = n^10 - 1.

Terms

a(0) =0a(1) =1023a(2) =59048a(3) =1048575a(4) =9765624a(5) =60466175a(6) =282475248a(7) =1073741823a(8) =3486784400a(9) =9999999999a(10) =25937424600a(11) =61917364223a(12) =137858491848a(13) =289254654975a(14) =576650390624