a(n) is the number of divisors of the concatenation of 1089 with itself n times.

Terms

a(0) =9a(1) =36a(2) =192a(3) =144a(4) =288a(5) =1536a(6) =576a(7) =4608a(8) =3840a(9) =4608a(10) =3072a(11) =12288a(12) =1152a(13) =9216a(14) =1572864a(15) =73728a(16) =2304a(17) =245760a(18) =144a(19) =73728a(20) =4718592a(21) =49152a(22) =2304a(23) =6291456a(24) =294912a(25) =18432a(26) =589824a(27) =294912a(28) =18432a(29) =100663296