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 | 44 |
| 1 | 309 |
| 2 | 2428 |
| 3 | 21234 |
| 4 | 205056 |
| 5 | 2170680 |
| 6 | 25022880 |
| 7 | 312273360 |
| 8 | 4196666880 |
| 9 | 60451816320 |
| 10 | 929459059200 |
| 11 | 15196285843200 |
| 12 | 263309095526400 |
| 13 | 4820517384883200 |
| 14 | 92987329455820800 |
| 15 | 1885246675183872000 |
| 16 | 40080616912207872000 |
| 17 | 891690242177839104000 |