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 | 9 |
| 3 | 45 |
| 4 | 15129 |
| 5 | 14082255 |
| 6 | 114228452529 |
| 7 | 5392746297039195 |
| 8 | 1669550033290419884241 |
| 9 | 3264068813720842706362349013 |
| 10 | 40741287160388602906800646716513609 |