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) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | 56 |
| 4 | 13833 |
| 5 | 6699824 |
| 6 | 5691917785 |
| 7 | 7785547001784 |
| 8 | 16086070907249329 |
| 9 | 47799861987366600992 |
| 10 | 196500286135805946117201 |
| 11 | 1082973554682091552092493880 |
| 12 | 7797122311868240909226166565881 |