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 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 12 |
| 6 | 72 |
| 7 | 54 |
| 8 | 432 |
| 9 | 36288 |
| 10 | 36288 |
| 11 | 399168 |
| 12 | 47916 |
| 13 | 622728 |
| 14 | 871782912 |
| 15 | 137674368 |
| 16 | 2922789888 |
| 17 | 35568742896 |
| 18 | 64237375728 |
| 19 | 121645148832 |
| 20 | 243292817664 |
| 21 | 5199421717944 |
| 22 | 11247277776768 |
| 23 | 258521673888497664 |
| 24 | 624484173323943936 |
| 25 | 15511214333985984 |
| 26 | 4329146112665635584 |