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 | 2 |
| 2 | 13 |
| 3 | 246 |
| 4 | 13554 |
| 5 | 2210436 |
| 6 | 1076561037 |
| 7 | 1570714992558 |
| 8 | 6871883750090694 |
| 9 | 90179738434097457084 |
| 10 | 3550105797469080332658354 |
| 11 | 419263945026939228053105930844 |
| 12 | 148543119421079567735277052592081220 |