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 | 120 |
| 2 | 10890 |
| 3 | 914760 |
| 4 | 74987451 |
| 5 | 6098153040 |
| 6 | 494603769780 |
| 7 | 40080553611120 |
| 8 | 3247001410058901 |
| 9 | 263019982119962760 |
| 10 | 21304965990387308670 |
| 11 | 1725711626112542281080 |
| 12 | 139782894999601166334351 |
| 13 | 11322421333652608793333280 |
| 14 | 917116312670388314093059560 |