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) |
|---|---|
| 2 | 1 |
| 3 | 6 |
| 4 | 51 |
| 5 | 580 |
| 6 | 8265 |
| 7 | 141246 |
| 8 | 2810437 |
| 9 | 63748728 |
| 10 | 1622579985 |
| 11 | 45775778950 |
| 12 | 1417347491241 |
| 13 | 47776074289164 |
| 14 | 1741386177576409 |
| 15 | 68238497945688630 |
| 16 | 2860625245955274225 |
| 17 | 127736893134458097136 |
| 18 | 6052712065187733972513 |
| 19 | 303322427195785592735502 |
| 20 | 16028016368907840953165425 |