n | a(n) |
---|---|
1 | 1 |
2 | 9 |
3 | 99 |
4 | 121 |
5 | 131 |
6 | 999 |
7 | 9999 |
8 | 12021 |
9 | 12121 |
10 | 13031 |
11 | 13131 |
12 | 99999 |
13 | 999999 |
14 | 1202021 |
15 | 1203021 |
16 | 1212121 |
17 | 1213121 |
18 | 1302031 |
19 | 1303031 |
20 | 1312131 |
21 | 1313131 |
22 | 9999999 |
23 | 99999999 |
24 | 120202021 |
25 | 120212021 |
26 | 120303021 |
27 | 120313021 |
28 | 121202121 |
29 | 121212121 |
[1,9,99,121,131,999,9999,12021,12121,13031,13131, 99999,999999,1202021,1203021,1212121,1213121, 1302031,1303031,1312131,1313131,9999999,99999999, 120202021,120212021,120303021,120313021,121202121, 121212121] |