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 | 40 |
| 2 | 960 |
| 3 | 17920 |
| 4 | 286720 |
| 5 | 4128768 |
| 6 | 55050240 |
| 7 | 692060160 |
| 8 | 8304721920 |
| 9 | 95965675520 |
| 10 | 1074815565824 |
| 11 | 11725260718080 |
| 12 | 125069447659520 |
| 13 | 1308418837053440 |
| 14 | 13458022323978240 |
| 15 | 136374626216312832 |
| 16 | 1363746262163128320 |
| 17 | 13477021884906209280 |
| 18 | 131775325096860712960 |