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 | 0 |
| 1 | 2 |
| 2 | 8 |
| 3 | 152 |
| 4 | 6200 |
| 5 | 442552 |
| 6 | 49399320 |
| 7 | 8003532512 |
| 8 | 1784040237288 |
| 9 | 525504809786112 |
| 10 | 198213959637435608 |
| 11 | 93352856625931514024 |
| 12 | 53776417402985961020144 |
| 13 | 37244016639064540041311632 |