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A057932 as a simple table

na(n)
00
11
212
3123
41234
512345
6123456
71234567
812345679
9123456790
101234567901
1112345679012
12123456790123
131234567901234
1412345679012345
15123456790123456
161234567901234567
1712345679012345679
18123456790123456790
191234567901234567901
2012345679012345679012
21123456790123456790123

[0,1,12,123,1234,12345,123456,1234567,12345679,
 123456790,1234567901,12345679012,123456790123,
 1234567901234,12345679012345,123456790123456,
 1234567901234567,12345679012345679,
 123456790123456790,1234567901234567901,
 12345679012345679012,123456790123456790123]