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 | 4 |
| 2 | 10 |
| 3 | 34 |
| 4 | 107 |
| 5 | 342 |
| 6 | 1069 |
| 7 | 3381 |
| 8 | 10689 |
| 9 | 33808 |
| 10 | 106804 |
| 11 | 337525 |
| 12 | 1066772 |
| 13 | 3371763 |
| 14 | 10656541 |
| 15 | 33680325 |
| 16 | 106448622 |
| 17 | 336438736 |
| 18 | 1063336915 |
| 19 | 3360744286 |
| 20 | 10621851017 |
| 21 | 33571065345 |
| 22 | 106103576857 |
| 23 | 335347363656 |
| 24 | 1059887498352 |
| 25 | 3349844553061 |