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 | 7 |
| 2 | 98 |
| 3 | 2058 |
| 4 | 57624 |
| 5 | 2016840 |
| 6 | 84707280 |
| 7 | 4150656720 |
| 8 | 232436776320 |
| 9 | 14643516908160 |
| 10 | 1025046183571200 |
| 11 | 78928556134982400 |
| 12 | 6629998715338521600 |
| 13 | 603329883095805465600 |
| 14 | 59126328543388935628800 |