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) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 105 |
| 3 | 2359 |
| 4 | 70665 |
| 5 | 2646007 |
| 6 | 118893705 |
| 7 | 6232661239 |
| 8 | 373405001865 |
| 9 | 25167452766967 |
| 10 | 1884759251911305 |
| 11 | 155262005162499319 |
| 12 | 13952854271421949065 |
| 13 | 1358385484966283220727 |
| 14 | 142418920493123648992905 |
| 15 | 15998363870912950298468599 |