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 | 8 |
| 2 | 80 |
| 3 | 640 |
| 4 | 6560 |
| 5 | 52480 |
| 6 | 524800 |
| 7 | 4198400 |
| 8 | 43046720 |
| 9 | 344373760 |
| 10 | 3443737600 |
| 11 | 27549900800 |
| 12 | 282386483200 |
| 13 | 2259091865600 |
| 14 | 22590918656000 |
| 15 | 180727349248000 |
| 16 | 1853020188851840 |
| 17 | 14824161510814720 |
| 18 | 148241615108147200 |