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) |
|---|---|
| 1 | 1 |
| 2 | 220 |
| 3 | 284 |
| 4 | 1980 |
| 5 | 2016 |
| 6 | 2556 |
| 7 | 3270960 |
| 8 | 3361680 |
| 9 | 3461040 |
| 10 | 3834000 |
| 11 | 53542288800 |
| 12 | 59509850400 |
| 13 | 59999219280 |
| 14 | 60074174160 |
| 15 | 61695597600 |