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 | 4 |
| 4 | 4 |
| 5 | 58 |
| 6 | 139 |
| 7 | 139 |
| 8 | 1597 |
| 9 | 1597 |
| 10 | 8158 |
| 11 | 8158 |
| 12 | 67207 |
| 13 | 67207 |
| 14 | 598648 |
| 15 | 2192971 |
| 16 | 6975940 |
| 17 | 21324847 |
| 18 | 21324847 |
| 19 | 21324847 |
| 20 | 408745336 |
| 21 | 1571006803 |
| 22 | 8544575605 |
| 23 | 29465282011 |
| 24 | 29465282011 |
| 25 | 217751639665 |
| 26 | 500181176146 |
| 27 | 1347469785589 |
| 28 | 6431201442247 |
| 29 | 6431201442247 |