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 | 9 |
| 3 | 87 |
| 4 | 1068 |
| 5 | 16022 |
| 6 | 284704 |
| 7 | 5834024 |
| 8 | 135430302 |
| 9 | 3511116537 |
| 10 | 100559404366 |
| 11 | 3152738985032 |
| 12 | 107400330425888 |
| 13 | 3950024143546665 |
| 14 | 155996847068247395 |
| 15 | 6584073072068125453 |
| 16 | 295764262988176583800 |
| 17 | 14088968131538370019982 |
| 18 | 709394716006812244474473 |