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 | 4 |
| 3 | 96 |
| 4 | 480 |
| 5 | 20160 |
| 6 | 129024 |
| 7 | 8294400 |
| 8 | 1423319040 |
| 9 | 8453652480 |
| 10 | 2463635865600 |
| 11 | 89117289676800 |
| 12 | 660834091008000 |
| 13 | 63038756487168000 |
| 14 | 20712734274355200000 |
| 15 | 4023397460155878604800 |
| 16 | 27460572284725493760000 |