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A087988 as a simple table

na(n)
10
21
32
411
5101
6111
71001
810001
910101
1011011
11100001
12101101
13110011
141000001
151001001
161100011
1710000001
1810011001
1910100101
2011000011
21100000001
22100010001
23100101001
24101000101
25110000011
261000000001
271000110001

[0,1,2,11,101,111,1001,10001,10101,11011,100001,
 101101,110011,1000001,1001001,1100011,10000001,
 10011001,10100101,11000011,100000001,100010001,
 100101001,101000101,110000011,1000000001,
 1000110001]