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 | 0 |
| 2 | 5 |
| 3 | 5 |
| 4 | 26 |
| 5 | 84 |
| 6 | 309 |
| 7 | 1108 |
| 8 | 3979 |
| 9 | 14314 |
| 10 | 51440 |
| 11 | 185083 |
| 12 | 665473 |
| 13 | 2393298 |
| 14 | 8606453 |
| 15 | 30950505 |
| 16 | 111303112 |
| 17 | 400265922 |
| 18 | 1439423515 |
| 19 | 5176415456 |
| 20 | 18615274437 |
| 21 | 66943726862 |
| 22 | 240741120250 |
| 23 | 865746384343 |
| 24 | 3113372499381 |
| 25 | 11196221683404 |