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A053052 as a simple table

na(n)
11
221
3123
44321
512345
6654321
71234567
887654321
9123456789
1010987654321
111234567891011
12121110987654321
1312345678910111213
141413121110987654321
15123456789101112131415

[1,21,123,4321,12345,654321,1234567,87654321,
 123456789,10987654321,1234567891011,
 121110987654321,12345678910111213,
 1413121110987654321,123456789101112131415]