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 | 6 |
| 3 | 6 |
| 4 | 6 |
| 5 | 3181503 |
| 6 | 213118335 |
| 7 | 21363375160 |
| 8 | 83495980981 |
| 9 | 595814595900153 |
| 10 | 2153650189195351 |
| 11 | 49340595918273751 |
| 12 | 3380756271799042653 |
| 13 | 13175529217290940503 |