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 | 2 |
| 3 | 2 |
| 4 | 2 |
| 5 | 91 |
| 6 | 6850 |
| 7 | 6850 |
| 8 | 10281 |
| 9 | 108771 |
| 10 | 171890 |
| 11 | 3760204 |
| 12 | 3760204 |
| 13 | 727940626 |
| 14 | 5704384304 |
| 15 | 13264434091 |
| 16 | 13264434091 |
| 17 | 63719307522 |
| 18 | 287480681209 |
| 19 | 607635436331 |