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A136866 as a simple table

na(n)
10
21
310
4100
51000
610000
710401
8100000
9104010
101000000
111004001
121040100
1310000000
1410040010
1510401000
16100000000
17100040001
18100400100
19104010000
201000000000
211000400010
221004001000
231040100000
2410000000000
2510000400001
2610004000100
2710040010000
2810401000000
29100000000000
30100004000010
31100040001000
32100400100000

[0,1,10,100,1000,10000,10401,100000,104010,
 1000000,1004001,1040100,10000000,10040010,
 10401000,100000000,100040001,100400100,104010000,
 1000000000,1000400010,1004001000,1040100000,
 10000000000,10000400001,10004000100,10040010000,
 10401000000,100000000000,100004000010,
 100040001000,100400100000]