This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 153153 |
| 2 | 171171 |
| 3 | 189189 |
| 4 | 207207 |
| 5 | 243243 |
| 6 | 261261 |
| 7 | 279279 |
| 8 | 297297 |
| 9 | 351351 |
| 10 | 459459 |
| 11 | 513513 |
| 12 | 567567 |
| 13 | 621621 |
| 14 | 729729 |
| 15 | 783783 |
| 16 | 837837 |
| 17 | 891891 |
| 18 | 999999 |
| 19 | 1392313923 |
| 20 | 1556115561 |
| 21 | 1719917199 |
| 22 | 1883718837 |
| 23 | 2034920349 |
| 24 | 2211322113 |
| 25 | 2375123751 |
| 26 | 2538925389 |
| 27 | 2702727027 |
| 28 | 3194131941 |
| 29 | 4176941769 |
| 30 | 4668346683 |