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A104490 as a simple table

na(n)
11
21
311
41
5101
6101
711
81
91001
101001
111011
121
13101
14101
1511
161
1710001
1810001
1910011
2010001
21101
22101
2311
241
251001
261001
271011
281
29101
30101
3111
321

[1,1,11,1,101,101,11,1,1001,1001,1011,1,101,101,
 11,1,10001,10001,10011,10001,101,101,11,1,1001,
 1001,1011,1,101,101,11,1]