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) |
|---|---|
| 1 | 0 |
| 2 | 344 |
| 3 | 8451 |
| 4 | 176128 |
| 5 | 465125 |
| 6 | 8190720 |
| 7 | 6569479 |
| 8 | 90177536 |
| 9 | 166341033 |
| 10 | 750016000 |
| 11 | 233671691 |
| 12 | 4193648640 |
| 13 | 878081581 |
| 14 | 14985313280 |
| 15 | 21730143375 |
| 16 | 46170898432 |
| 17 | 7384597649 |
| 18 | 161217941760 |
| 19 | 17874835219 |
| 20 | 384008192000 |
| 21 | 414816720885 |