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 | 60 |
| 2 | 2240 |
| 3 | 67200 |
| 4 | 1779456 |
| 5 | 43545600 |
| 6 | 1010606080 |
| 7 | 22600089600 |
| 8 | 492077121536 |
| 9 | 10505429975040 |
| 10 | 221005133905920 |
| 11 | 4597756408627200 |
| 12 | 94837435443183616 |
| 13 | 1943344895628410880 |
| 14 | 39618196941842677760 |