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 | 1 |
| 2 | 9 |
| 3 | 63 |
| 4 | 99 |
| 5 | 441 |
| 6 | 693 |
| 7 | 5103 |
| 8 | 1881 |
| 9 | 5733 |
| 10 | 4851 |
| 11 | 35721 |
| 12 | 9009 |
| 13 | 194481 |
| 14 | 56133 |
| 15 | 51597 |
| 16 | 27027 |
| 17 | 2893401 |
| 18 | 63063 |
| 19 | 2711943423 |
| 20 | 81081 |
| 21 | 464373 |
| 22 | 392931 |
| 23 | 670761 |
| 24 | 153153 |
| 25 | 2528253 |
| 26 | 2139291 |
| 27 | 693693 |
| 28 | 729729 |
| 29 | 18983603961 |
| 30 | 567567 |
| 31 | 1441237924662543 |
| 32 | 459459 |
| 33 | 4322241 |
| 34 | 31827411 |
| 35 | 22754277 |