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 | 960 |
| 5 | 14736 |
| 6 | 272448 |
| 7 | 5881968 |
| 8 | 145105920 |
| 9 | 4026744576 |
| 10 | 124159039488 |
| 11 | 4211132779008 |
| 12 | 155814875873280 |
| 13 | 6245695887446016 |
| 14 | 269610827961212928 |
| 15 | 12469729905669224448 |
| 16 | 615184657168540631040 |
| 17 | 32246522356406129197056 |
| 18 | 1789714914567248392224768 |