Number of n-digit Kaprekar numbers (A006886).

Terms

a(0) =2a(1) =3a(2) =3a(3) =9a(4) =7a(5) =30a(6) =8a(7) =29a(8) =11a(9) =30a(10) =17a(11) =115a(12) =17a(13) =35a(14) =69a(15) =118a(16) =24a(17) =235a(18) =28a(19) =245a(20) =119a(21) =124a(22) =100a(23) =926a(24) =70a(25) =124a(26) =77a(27) =547a(28) =788a(29) =7420