a(n) is the number of divisors of N, where N = concatenation of n taken n times.

Terms

a(0) =1a(1) =4a(2) =6a(3) =12a(4) =8a(5) =96a(6) =8a(7) =64a(8) =20a(9) =256a(10) =96a(11) =2304a(12) =64a(13) =512a(14) =12288a(15) =5120a(16) =64a(17) =5120a(18) =8a(19) =6144a(20) =24576a(21) =3072a(22) =64a(23) =24576a(24) =1536a(25) =1024a(26) =7168a(27) =12288a(28) =256a(29) =3145728