n | a(n) |
---|---|
1 | 1 |
2 | 21 |
3 | 123 |
4 | 4321 |
5 | 12345 |
6 | 654321 |
7 | 1234567 |
8 | 87654321 |
9 | 123456789 |
10 | 10987654321 |
11 | 1234567891011 |
12 | 121110987654321 |
13 | 12345678910111213 |
14 | 1413121110987654321 |
15 | 123456789101112131415 |
[1,21,123,4321,12345,654321,1234567,87654321, 123456789,10987654321,1234567891011, 121110987654321,12345678910111213, 1413121110987654321,123456789101112131415] |