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 | 4 |
| 3 | 36 |
| 4 | 368 |
| 5 | 5200 |
| 6 | 90432 |
| 7 | 1884736 |
| 8 | 45817088 |
| 9 | 1273874688 |
| 10 | 39891461120 |
| 11 | 1389816423424 |
| 12 | 53334303584256 |
| 13 | 2235679577657344 |
| 14 | 101651458028158976 |
| 15 | 4983219643056537600 |
| 16 | 262026143585449607168 |
| 17 | 14711289584591513387008 |