The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 10 |
| 4 | 100 |
| 5 | 1000 |
| 6 | 10000 |
| 7 | 100000 |
| 8 | 100501 |
| 9 | 550501 |
| 10 | 551501 |
| 11 | 1000000 |
| 12 | 1005010 |
| 13 | 5505010 |
| 14 | 5515010 |
| 15 | 10000000 |
| 16 | 10005001 |
| 17 | 10050100 |
| 18 | 10055001 |
| 19 | 55050100 |
| 20 | 55055001 |
| 21 | 55150100 |
| 22 | 100000000 |
| 23 | 100050010 |
| 24 | 100501000 |
| 25 | 100550010 |
| 26 | 550501000 |
| 27 | 550550010 |
| 28 | 551501000 |
| 29 | 1000000000 |
| 30 | 1000050001 |
| 31 | 1000050501 |
| 32 | 1000500100 |
| 33 | 1000501451 |
| 34 | 1000550001 |
| 35 | 1000550501 |
[0,1,10,100,1000,10000,100000,100501,550501, 551501,1000000,1005010,5505010,5515010,10000000, 10005001,10050100,10055001,55050100,55055001, 55150100,100000000,100050010,100501000,100550010, 550501000,550550010,551501000,1000000000, 1000050001,1000050501,1000500100,1000501451, 1000550001,1000550501] |