a(n) is the number of divisors of the concatenation of 2178 with itself n times.

Terms

a(0) =18a(1) =72a(2) =384a(3) =288a(4) =576a(5) =3072a(6) =1152a(7) =9216a(8) =7680a(9) =9216a(10) =6144a(11) =24576a(12) =2304a(13) =18432a(14) =3145728a(15) =147456a(16) =4608a(17) =491520a(18) =288a(19) =147456a(20) =9437184a(21) =98304a(22) =4608a(23) =12582912a(24) =589824a(25) =36864a(26) =1179648a(27) =589824a(28) =36864a(29) =201326592