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) |
|---|---|
| 2 | 1 |
| 3 | 3 |
| 4 | 9 |
| 5 | 93 |
| 6 | 315 |
| 7 | 3855 |
| 8 | 13797 |
| 9 | 182361 |
| 10 | 9256395 |
| 11 | 34636833 |
| 12 | 1857283155 |
| 13 | 26817356775 |
| 14 | 102280151421 |
| 15 | 1497207322929 |
| 16 | 84973577874915 |
| 17 | 4885260612740877 |
| 18 | 18900352534538475 |
| 19 | 1101298153654301589 |
| 20 | 16628050996019877513 |
| 21 | 64689951820132126215 |
| 22 | 3825714619033636628817 |