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 | 22 |
| 2 | 484 |
| 3 | 6504 |
| 4 | 57238 |
| 5 | 367216 |
| 6 | 1856100 |
| 7 | 7795951 |
| 8 | 28248007 |
| 9 | 90732638 |
| 10 | 263650284 |
| 11 | 703980614 |
| 12 | 1748547620 |
| 13 | 4079672416 |
| 14 | 9012596316 |
| 15 | 18975151965 |
| 16 | 38281575869 |
| 17 | 74344179766 |
| 18 | 139521245076 |
| 19 | 253869738212 |
| 20 | 449160402594 |
| 21 | 774624001120 |