Smallest positive integer with n anagrams.

Terms

a(0) =1a(1) =12a(2) =112a(3) =102a(4) =11112a(5) =123a(6) =1111112a(7) =10002a(8) =1012a(9) =11122a(10) =11111111112a(11) =1123a(13) =10000002a(14) =111122a(15) =10112a(17) =1023a(19) =11123a(20) =1111122a(21) =100000000002