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 | 20 |
| 2 | 1876 |
| 3 | 229680 |
| 4 | 31497284 |
| 5 | 4600393936 |
| 6 | 699440711760 |
| 7 | 109341854545792 |
| 8 | 17445620031680100 |
| 9 | 2827280025640259280 |
| 10 | 463882742476664594512 |
| 11 | 76875122571167921990080 |
| 12 | 12845419277094419018993808 |
| 13 | 2161338658294952555703260480 |
| 14 | 365816910931667192749720139072 |