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) |
|---|---|
| 3 | 9 |
| 4 | 95 |
| 5 | 791 |
| 6 | 7799 |
| 7 | 85391 |
| 8 | 1248959 |
| 9 | 4717271 |
| 10 | 39916679 |
| 11 | 518918231 |
| 12 | 6227020631 |
| 13 | 143221477871 |
| 14 | 1482030950111 |
| 15 | 61460695293791 |
| 16 | 1108907864061191 |
| 17 | 20985558257660519 |
| 18 | 262497321934846319 |
| 19 | 12286155141292021799 |
| 20 | 75419962253475839039 |