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) |
|---|---|
| 5 | 1 |
| 6 | 6 |
| 7 | 42 |
| 8 | 280 |
| 9 | 1890 |
| 10 | 12978 |
| 11 | 91938 |
| 12 | 671616 |
| 13 | 5064345 |
| 14 | 39439400 |
| 15 | 317158842 |
| 16 | 2631497232 |
| 17 | 22512271964 |
| 18 | 198412838820 |
| 19 | 1800062132940 |
| 20 | 16795556650200 |
| 21 | 161038724157045 |
| 22 | 1585408383273330 |
| 23 | 16013462706719170 |
| 24 | 165819496710741720 |
| 25 | 1759058150311036806 |
| 26 | 19103856738729254206 |