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A077440 as a simple table

na(n)
10
21
3100
410000
51000000
61100401
7100000000
8110040100
910000000000
1010100049001
1111004010000
121000000000000
131010004900100
141100401000000
15100000000000000
16100100004990001
17101000490010000
18110040100000000

[0,1,100,10000,1000000,1100401,100000000,
 110040100,10000000000,10100049001,11004010000,
 1000000000000,1010004900100,1100401000000,
 100000000000000,100100004990001,101000490010000,
 110040100000000]