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A199683 as a simple table

na(n)
04
131
2301
33001
430001
5300001
63000001
730000001
8300000001
93000000001
1030000000001
11300000000001
123000000000001
1330000000000001
14300000000000001
153000000000000001
1630000000000000001
17300000000000000001
183000000000000000001

[4,31,301,3001,30001,300001,3000001,30000001,
 300000001,3000000001,30000000001,300000000001,
 3000000000001,30000000000001,300000000000001,
 3000000000000001,30000000000000001,
 300000000000000001,3000000000000000001]