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 | 5 |
| 1 | 440 |
| 2 | 16016 |
| 3 | 366080 |
| 4 | 6223360 |
| 5 | 85995520 |
| 6 | 1018716160 |
| 7 | 10711072768 |
| 8 | 102385254400 |
| 9 | 905301196800 |
| 10 | 7501067059200 |
| 11 | 58822597017600 |
| 12 | 439993025691648 |
| 13 | 3158924287016960 |
| 14 | 21879051958353920 |
| 15 | 146801380881858560 |