a(n) = (A138793(n+1)-A138793(n))/10^n.

Terms

a(0) =2a(1) =3a(2) =4a(3) =5a(4) =6a(5) =7a(6) =8a(7) =9a(8) =1a(9) =110a(10) =2100a(11) =31000a(12) =410000a(13) =5100000a(14) =61000000a(15) =710000000a(16) =8100000000a(17) =91000000000a(18) =20000000000