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 | 3 |
| 2 | 5 |
| 3 | 11 |
| 4 | 23 |
| 5 | 179 |
| 6 | 239 |
| 7 | 359 |
| 8 | 719 |
| 9 | 5039 |
| 10 | 55439 |
| 11 | 665279 |
| 12 | 6486479 |
| 13 | 32432399 |
| 14 | 698377679 |
| 15 | 735134399 |
| 16 | 1102701599 |
| 17 | 20951330399 |
| 18 | 3212537327999 |
| 19 | 149602080797769599 |
| 20 | 299204161595539199 |
| 21 | 2718551763981393634806325317503999 |