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A069054 as a simple table

na(n)
10
21
39
4901
5901009
6901009000901
7901009000901000000901009
8901009000901000000901009000000000000901009000901
9901009000901000000901009000000000000901009000901000000000000000000000000901009000901000000901009

[0,1,9,901,901009,901009000901,
 901009000901000000901009,
 901009000901000000901009000000000000901009000901,
 90100900090100000090100900000000000090100900090100\
 0000000000000000000000901009000901000000901009]