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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 44 |
| 5 | 912 |
| 6 | 61952 |
| 7 | 8160260 |
| 8 | 888954284 |
| 9 | 180955852060 |
| 10 | 50317255621843 |
| 11 | 12251146829850324 |
| 12 | 4243527581615332664 |
| 13 | 1602629887788636447221 |
| 14 | 622433536382831426225696 |
| 15 | 344515231090957672408413959 |