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 | 35 |
| 2 | 616 |
| 3 | 7644 |
| 4 | 76440 |
| 5 | 659736 |
| 6 | 5116320 |
| 7 | 36581688 |
| 8 | 245402157 |
| 9 | 1563837275 |
| 10 | 9553624080 |
| 11 | 56338955400 |
| 12 | 322432175520 |
| 13 | 1798432526880 |
| 14 | 9809631964800 |
| 15 | 52470868368240 |
| 16 | 275857874141850 |
| 17 | 1428186531145374 |