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) |
|---|---|
| 2 | 1 |
| 3 | 8 |
| 4 | 49 |
| 5 | 276 |
| 6 | 1504 |
| 7 | 8082 |
| 8 | 43193 |
| 9 | 230536 |
| 10 | 1231484 |
| 11 | 6591350 |
| 12 | 35369380 |
| 13 | 190329098 |
| 14 | 1027180798 |
| 15 | 5559635866 |
| 16 | 30176648513 |
| 17 | 164237973028 |
| 18 | 896188159820 |
| 19 | 4902187071922 |
| 20 | 26877397858264 |
| 21 | 147684225578318 |
| 22 | 813159429830590 |