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 | 3 |
| 2 | 15 |
| 3 | 110 |
| 4 | 1083 |
| 5 | 13482 |
| 6 | 203569 |
| 7 | 3618540 |
| 8 | 74058105 |
| 9 | 1715620148 |
| 10 | 44384718879 |
| 11 | 1268498827752 |
| 12 | 39692276983555 |
| 13 | 1349678904881400 |
| 14 | 49556966130059553 |
| 15 | 1954156038072106448 |
| 16 | 82363978221026323761 |
| 17 | 3695194039210436996400 |