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A031997 as a simple table

na(n)
11
211
3101
41001
510001
6100001
7684917
81000001
910000001
10100000001
111000000001
1210000000001
13100000000001
141000000000001
1510000000000001
16100000000000001
171000000000000001
1810000000000000001
19100000000000000001
201000000000000000001

[1,11,101,1001,10001,100001,684917,1000001,
 10000001,100000001,1000000001,10000000001,
 100000000001,1000000000001,10000000000001,
 100000000000001,1000000000000001,
 10000000000000001,100000000000000001,
 1000000000000000001]