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 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 7 |
| 5 | 12 |
| 6 | 56 |
| 7 | 109 |
| 8 | 368 |
| 9 | 1332 |
| 10 | 5656 |
| 11 | 28248 |
| 12 | 140547 |
| 13 | 774325 |
| 14 | 8485151 |
| 15 | 34339452 |
| 16 | 397492132 |
| 17 | 3996973827 |
| 18 | 63229707890 |
| 19 | 1039037824132 |
| 20 | 10853561442116 |
| 21 | 305279835527631 |
| 22 | 4240235842471234 |
| 23 | 117388244641426491 |
| 24 | 3997445934568646292 |
| 25 | 99999889989926488708 |