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 | 1 |
| 3 | 5 |
| 4 | 16 |
| 5 | 69 |
| 6 | 226 |
| 7 | 923 |
| 8 | 3312 |
| 9 | 12825 |
| 10 | 47896 |
| 11 | 184755 |
| 12 | 700712 |
| 13 | 2704155 |
| 14 | 10373455 |
| 15 | 40113421 |
| 16 | 154946976 |
| 17 | 601080389 |
| 18 | 2332498482 |
| 19 | 9075135299 |
| 20 | 35338355380 |
| 21 | 137846298360 |
| 22 | 538213522254 |
| 23 | 2104098963719 |
| 24 | 8233142596640 |
| 25 | 32247603662625 |
| 26 | 126408753954731 |
| 27 | 495918514791900 |