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 | 1 |
| 2 | 8 |
| 3 | 78 |
| 4 | 876 |
| 5 | 10956 |
| 6 | 149472 |
| 7 | 2195208 |
| 8 | 34398288 |
| 9 | 571525200 |
| 10 | 10022997888 |
| 11 | 184897670112 |
| 12 | 3578224662720 |
| 13 | 72486450479808 |
| 14 | 1534267158087168 |
| 15 | 33877135427154048 |
| 16 | 779208751651730688 |
| 17 | 18645519786163266816 |