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 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 14 |
| 5 | 61 |
| 6 | 414 |
| 7 | 3416 |
| 8 | 34274 |
| 9 | 394009 |
| 10 | 5113712 |
| 11 | 73758368 |
| 12 | 1170495180 |
| 13 | 20263806277 |
| 14 | 380048113202 |
| 15 | 7676106638884 |
| 16 | 166114210737254 |
| 17 | 3834434327929981 |
| 18 | 94042629562443206 |
| 19 | 2442147034770292496 |
| 20 | 66942194906543381336 |
| 21 | 1931543452346146410965 |
| 22 | 58519191359170883258606 |