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 | 0 |
| 2 | 1 |
| 3 | 5 |
| 4 | 13 |
| 5 | 23 |
| 6 | 47 |
| 7 | 59 |
| 8 | 59 |
| 9 | 839 |
| 10 | 1679 |
| 11 | 2519 |
| 12 | 15119 |
| 13 | 27719 |
| 14 | 138599 |
| 15 | 360359 |
| 16 | 360359 |
| 17 | 720719 |
| 18 | 8648639 |
| 19 | 12252239 |
| 20 | 208288079 |
| 21 | 232792559 |
| 22 | 232792559 |
| 23 | 232792559 |
| 24 | 2327925599 |
| 25 | 5354228879 |
| 26 | 16062686639 |
| 27 | 26771144399 |
| 28 | 26771144399 |
| 29 | 80313433199 |
| 30 | 1204701497999 |
| 31 | 2329089562799 |
| 32 | 16303626939599 |
| 33 | 144403552893599 |